Methane

Formula: CH₄
Molecular weight: 16.0425
IUPAC Standard InChI: InChI=1S/CH4/h1H4
IUPAC Standard InChIKey: VNWKTOKETHGBQD-UHFFFAOYSA-N
CAS Registry Number: 74-82-8
Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript.
Other names: Marsh gas; Methyl hydride; CH4; Fire Damp; R 50; Biogas; R 50 (refrigerant)
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Information on this page:
Other data available:
- Reaction thermochemistry data: reactions 51 to 100, reactions 101 to 112
- IR Spectrum
- Vibrational and/or electronic energy levels
- Fluid Properties
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Gas phase thermochemistry data

Go To: Top, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data compiled as indicated in comments:
DRB - Donald R. Burgess, Jr.
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	-74.87	kJ/mol	Review	Chase, 1998	Data last reviewed in March, 1961
Δ_fH°_gas	-74.6 ± 0.3	kJ/mol	Review	Manion, 2002	adopted recommendation of Gurvich, Veyts, et al., 1991; DRB
Δ_fH°_gas	-74.5 ± 0.4	kJ/mol	Ccb	Pittam and Pilcher, 1972	ALS
Δ_fH°_gas	-74.85 ± 0.31	kJ/mol	Ccb	Prosen and Rossini, 1945	Hf derived from Heat of Hydrogenation; ALS
Δ_fH°_gas	-73.4 ± 1.1	kJ/mol	Ccb	Roth and Banse, 1932	Reanalyzed by Cox and Pilcher, 1970, Original value = -75.19 kJ/mol; ALS
Quantity	Value	Units	Method	Reference	Comment
Δ_cH°_gas	-890.7 ± 0.4	kJ/mol	Ccb	Pittam and Pilcher, 1972	Corresponding Δ_fHº_gas = -74.48 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Δ_cH°_gas	-890.35 ± 0.30	kJ/mol	Ccb	Prosen and Rossini, 1945	Hf derived from Heat of Hydrogenation; Corresponding Δ_fHº_gas = -74.822 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Δ_cH°_gas	-891.8 ± 1.1	kJ/mol	Ccb	Roth and Banse, 1932	Reanalyzed by Cox and Pilcher, 1970, Original value = -887.3 ± 1.0 kJ/mol; Corresponding Δ_fHº_gas = -73.39 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Δ_cH°_gas	-890.16 ± 0.30	kJ/mol	Cm	Rossini, 1931	Corresponding Δ_fHº_gas = -75.010 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Quantity	Value	Units	Method	Reference	Comment
S°_gas	188.66 ± 0.42	J/mol*K	N/A	Colwell J.H., 1963	The calorimetric value is significantly higher than the statistically calculated entropy, 186.26 J/molK, which remains the best value for use in thermodynamic calculations [ Vogt G.J., 1976, Friend D.G., 1989, Gurvich, Veyts, et al., 1989]. Earlier the value of 185.3 J/molK was calculated from experimental data [ Giauque W.F., 1931]. The value of S(298.15 K)=185.94 J/mol*K was obtained by high accuracy ab initio calculation [ East A.L.L., 1997].; GT
Quantity	Value	Units	Method	Reference	Comment
S°_{gas,1 bar}	186.25	J/mol*K	Review	Chase, 1998	Data last reviewed in March, 1961

Constant pressure heat capacity of gas

C_p,gas (J/mol*K)	Temperature (K)	Reference	Comment
34.92 ± 0.25	279.	Halford J.O., 1957	GT

Constant pressure heat capacity of gas

C_p,gas (J/mol*K)	Temperature (K)	Reference	Comment
33.28	100.	Gurvich, Veyts, et al., 1989	p=1 bar. Because of more precise method of calculation, the recommended values are more accurate, especially at high temperatures, than those obtained by [ McDowell R.S., 1963] and often regarded as reference data [ Friend D.G., 1989].; GT
33.51	200.
35.69	298.15
35.76	300.
40.63	400.
46.63	500.
52.74	600.
58.60	700.
64.08	800.
69.14	900.
73.75	1000.
77.92	1100.
81.68	1200.
85.07	1300.
88.11	1400.
90.86	1500.
93.33	1600.
95.58	1700.
97.63	1800.
99.51	1900.
101.24	2000.
102.83	2100.
104.31	2200.
105.70	2300.
107.00	2400.
108.23	2500.
109.39	2600.
110.50	2700.
111.56	2800.
112.57	2900.
113.55	3000.

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
C_p = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.

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View table.

Temperature (K)	298. to 1300.	1300. to 6000.
A	-0.703029	85.81217
B	108.4773	11.26467
C	-42.52157	-2.114146
D	5.862788	0.138190
E	0.678565	-26.42221
F	-76.84376	-153.5327
G	158.7163	224.4143
H	-74.87310	-74.87310
Reference	Chase, 1998	Chase, 1998
Comment	Data last reviewed in March, 1961	Data last reviewed in March, 1961

Phase change data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
DH - Eugene S. Domalski and Elizabeth D. Hearing
AC - William E. Acree, Jr., James S. Chickos

Quantity	Value	Units	Method	Reference	Comment
T_boil	111. ± 2.	K	AVG	N/A	Average of 13 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
T_fus	85.7	K	N/A	Streng, 1971	Uncertainty assigned by TRC = 0.2 K; TRC
T_fus	90.6	K	N/A	Van't Zelfde, Omar, et al., 1968	Uncertainty assigned by TRC = 0.3 K; TRC
T_fus	91.2	K	N/A	Timmermans, 1935	Uncertainty assigned by TRC = 2. K; TRC
T_fus	90.6	K	N/A	Clusius, 1929	Uncertainty assigned by TRC = 0.2 K; TRC
T_fus	90.5	K	N/A	Eucken and Karwat, 1924	Uncertainty assigned by TRC = 0.2 K; TRC
Quantity	Value	Units	Method	Reference	Comment
T_triple	90.67 ± 0.03	K	AVG	N/A	Average of 25 out of 32 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
P_triple	0.1169 ± 0.0006	bar	AVG	N/A	Average of 20 out of 23 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
T_c	190.6 ± 0.3	K	AVG	N/A	Average of 19 out of 23 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
P_c	46.1 ± 0.3	bar	AVG	N/A	Average of 16 out of 21 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
V_c	0.09860	l/mol	N/A	Ambrose and Tsonopoulos, 1995
V_c	0.09852	l/mol	N/A	Younglove and Ely, 1987	TRC
V_c	0.100	l/mol	N/A	Terry, Lynch, et al., 1969	Uncertainty assigned by TRC = 0.001 l/mol; TRC
Quantity	Value	Units	Method	Reference	Comment
ρ_c	10.1 ± 0.2	mol/l	AVG	N/A	Average of 16 out of 17 values; Individual data points

Enthalpy of vaporization

Δ_vapH (kJ/mol)	Temperature (K)	Method	Reference	Comment
8.519	99.54	N/A	Vogt and Pitzer, 1976	P = 2.81 kPa Data from Frank and Clusius, 1937 and 39FRA/CLU.; DH
8.6	101.	N/A	Stock, Henning, et al., 2006	Based on data from 92. to 110. K. See also Boublik, Fried, et al., 1984.; AC
8.6	105.	A	Stephenson and Malanowski, 1987	Based on data from 90. to 120. K.; AC
8.4	134.	A	Stephenson and Malanowski, 1987	Based on data from 115. to 149. K.; AC
8.7	174.	A	Stephenson and Malanowski, 1987	Based on data from 148. to 189. K.; AC
8.17	111.7	N/A	Majer and Svoboda, 1985
8.6	112.	N/A	Ott, Goates, et al., 1972	Based on data from 91. to 127. K. See also Boublik, Fried, et al., 1984.; AC
8.5	175.	N/A	Ott, Goates, et al., 1972	Based on data from 91. to 190. K.; AC
8.1	137.	N/A	Reid, 1972	AC
8.6	175.	N/A	Ambrose, Counsell, et al., 1970	Based on data from 100. to 190. K.; AC
8.2	112.	C	Hestermans and White, 1961	AC
7.5	130.	C	Hestermans and White, 1961	AC
5.9	160.	C	Hestermans and White, 1961	AC
4.0	180.	C	Hestermans and White, 1961	AC
8.5	149.	N/A	Hestermans and White, 1961	Based on data from 109. to 189. K.; AC
8.5 ± 0.1	99.	N/A	Frank and Clusius, 1939	AC

Enthalpy of vaporization

Δ_vapH = A exp(-αT_r) (1 − T_r)^β
Δ_vapH = Enthalpy of vaporization (at saturation pressure) (kJ/mol)
T_r = reduced temperature (T / T_c)

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Temperature (K)	112. to 180.
A (kJ/mol)	10.11
α	-0.22
β	0.388
T_c (K)	190.6
Reference	Majer and Svoboda, 1985

Entropy of vaporization

Δ_vapS (J/mol*K)	Temperature (K)	Reference	Comment
85.58	99.54	Vogt and Pitzer, 1976	P; DH

Antoine Equation Parameters

log₁₀(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)

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Temperature (K)	A	B	C	Reference	Comment
90.99 to 189.99	3.9895	443.028	-0.49	Prydz and Goodwin, 1972	Coefficents calculated by NIST from author's data.
96.89 to 110.19	2.00253	125.819	-48.823	Regnier, 1972	Coefficents calculated by NIST from author's data.
93.04 to 107.84	3.80235	403.106	-5.479	Cutler and Morrison, 1965	Coefficents calculated by NIST from author's data.
110.00 to 190.5	4.22061	516.689	11.223	Hestermans and White, 1961	Coefficents calculated by NIST from author's data.

Enthalpy of sublimation

Δ_subH (kJ/mol)	Temperature (K)	Method	Reference	Comment
9.7	72.	N/A	Stephenson and Malanowski, 1987	Based on data from 53. to 91. K.; AC
9.2	72.	N/A	Bondi, 1963	Based on data from 54. to 90. K. See also Armstrong, Brickwedde, et al., 1955.; AC
10.0	84.	N/A	Jones, 1960	Based on data from 79. to 89. K.; AC
9.7	63.	A,MS	Tickner and Lossing, 1951	Based on data from 48. to 78. K.; AC
9.62	77.	A	Stull, 1947	Based on data from 67. to 88. K.; AC

Enthalpy of phase transition

ΔH_trs (kJ/mol)	Temperature (K)	Initial Phase	Final Phase	Reference	Comment
0.09355	20.53	crystaline, II	crystaline, I	Vogt and Pitzer, 1976	Lambda transition.; DH
0.9392	90.67	crystaline, I	liquid	Vogt and Pitzer, 1976	DH

Entropy of phase transition

ΔS_trs (J/mol*K)	Temperature (K)	Initial Phase	Final Phase	Reference	Comment
4.557	20.53	crystaline, II	crystaline, I	Vogt and Pitzer, 1976	Lambda; DH
10.36	90.67	crystaline, I	liquid	Vogt and Pitzer, 1976	DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
MS - José A. Martinho Simões
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Reactions 1 to 50

CH₃^- + = Methane

By formula: CH₃^- + H⁺ = CH₄

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1743.6 ± 2.9	kJ/mol	D-EA	Ellison, Engelking, et al., 1978	gas phase; B
Δ_rH°	1749. ± 15.	kJ/mol	CIDT	Graul and Squires, 1990	gas phase; B
Δ_rH°	>1691.1 ± 0.42	kJ/mol	G+TS	Bohme, Lee-Ruff, et al., 1972	gas phase; B
Δ_rH°	1735.5	kJ/mol	N/A	Check, Faust, et al., 2001	gas phase; FeBr3; ; ΔS(EA)=9.3; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1709.8 ± 3.3	kJ/mol	H-TS	Ellison, Engelking, et al., 1978	gas phase; B
Δ_rG°	1715. ± 15.	kJ/mol	H-TS	Graul and Squires, 1990	gas phase; B
Δ_rG°	>1657.3	kJ/mol	IMRB	Bohme, Lee-Ruff, et al., 1972	gas phase; B
Δ_rG°	1704.1	kJ/mol	N/A	Check, Faust, et al., 2001	gas phase; FeBr3; ; ΔS(EA)=9.3; B

(CH₅⁺ • Methane ) + Methane = (CH₅⁺ • 2 Methane )

By formula: (CH₅⁺ • CH₄) + CH₄ = (CH₅⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	22. ± 1.	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	25.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rH°	6.3	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	104.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	102.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rS°	30.	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

CH₅⁺ + Methane = (CH₅⁺ • Methane )

By formula: CH₅⁺ + CH₄ = (CH₅⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	29. ± 1.	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	31.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rH°	17.	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.5	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	87.0	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rS°	51.9	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

C₂H₅⁺ + Methane = (C₂H₅⁺ • Methane )

By formula: C₂H₅⁺ + CH₄ = (C₂H₅⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	23.0	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rH°	28.	kJ/mol	PHPMS	Hiroka and Kebarle, 1975	gas phase; M
Δ_rH°	10.	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rS°	97.9	J/mol*K	PHPMS	Hiroka and Kebarle, 1975	gas phase; M
Δ_rS°	36.	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

( • 2 Methane ) + Methane = ( • 3 Methane )

By formula: (Co⁺ • 2CH₄) + CH₄ = (Co⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	46.	kJ/mol	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
41. (+5.0,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
3.	477.	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M

+ Methane = ( • Methane )

By formula: Co⁺ + CH₄ = (Co⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.8	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(530 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	Method	Reference	Comment
90.0 (+6.7,-0.)	CID	Haynes and Armentrout, 1996	gas phase; guided ion beam CID; M
90.0 (+5.9,-0.)	CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M
94. (+2.,-0.)	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(530 K); M

( • Methane ) + = ( • • Methane )

By formula: (Co⁺ • CH₄) + H₂ = (Co⁺ • H₂ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	95.8	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+).2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
73. (+3.,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+).2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • H₂) + CH₄ = (Co⁺ • CH₄ • H₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+)2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
94.6 (+5.0,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+)2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

(g) = C₅MnO₅ (g) + Methane (g)

By formula: C₆H₃MnO₅ (g) = C₅MnO₅ (g) + CH₄ (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	192. ± 15.	kJ/mol	PIMS	Martinho Simões and Beauchamp, 1990	The reaction enthalpy was derived from the appearance energy of Mn(CO)5(+), 940.7 ± 4.8 kJ/mol, using Mn(CO)5(Me) as the neutral precursor, together with the adiabatic ionization energy of Mn(CO)5 radical, 749. ± 14. kJ/mol Martinho Simões and Beauchamp, 1990; MS

( • Methane ) + Methane = ( • 2 Methane )

By formula: (Co⁺ • CH₄) + CH₄ = (Co⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	109.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(500 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
95.8 (+5.0,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M
104. (+4.2,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(500 K); M

(CH₅⁺ • 2 Methane ) + Methane = (CH₅⁺ • 3 Methane )

By formula: (CH₅⁺ • 2CH₄) + CH₄ = (CH₅⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13.1 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	17.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	93.7	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	109.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M

(CH₅⁺ • 3 Methane ) + Methane = (CH₅⁺ • 4 Methane )

By formula: (CH₅⁺ • 3CH₄) + CH₄ = (CH₅⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.6 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	16.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	99.2	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	111.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M

(g) + CH₃BrMg (solution) = Methane (solution) + Br₂Mg (solution)

By formula: HBr (g) + CH₃BrMg (solution) = CH₄ (solution) + Br₂Mg (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-274.5 ± 2.2	kJ/mol	RSC	Holm, 1981	solvent: Diethyl ether; The enthalpy of formation was calculated using the assumptions and the auxiliary data in Holm, 1981, except for the organic compound, whose enthalpy of formation was quoted from Pedley, 1994; MS

( • Methane ) + = ( • • Methane )

By formula: (Co⁺ • CH₄) + C₂H₆ = (Co⁺ • C₂H₆ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	108.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+).2CH4, Δ_rS(480 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
119. (+5.4,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+).2CH4, Δ_rS(480 K); M

C₆₃H₉₁CoN₁₃O₁₄P (solution) = (solution) + Methane (solution)

By formula: C₆₃H₉₁CoN₁₃O₁₄P (solution) = C₆₃H₈₈CoN₁₄O₁₄P (solution) + CH₄ (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	155. ± 13.	kJ/mol	KinS	Martin and Finke, 1990	solvent: Ethylene glycol; Please also see Martin and Finke, 1992. The reaction enthalpy relies on 172. ± 13. kJ/mol for the reaction activation enthalpy. The reaction refers to "base-on" cobalamine.; MS

C₃H₇⁺ + Methane = (C₃H₇⁺ • Methane )

By formula: C₃H₇⁺ + CH₄ = (C₃H₇⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rH°	14.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1976	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	72.8	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rS°	84.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1976	gas phase; M

+ = Methane +

By formula: HI + CH₃I = CH₄ + I₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-52.55 ± 0.54	kJ/mol	Eqk	Golden, Walsh, et al., 1965	gas phase; ALS
Δ_rH°	-53.0 ± 0.2	kJ/mol	Eqk	Goy and Pritchard, 1965	gas phase; ALS
Δ_rH°	-46.2 ± 5.6	kJ/mol	Cm	Nichol and Ubbelohde, 1952	gas phase; ALS

(C₂H₅⁺ • 9 Methane ) + Methane = (C₂H₅⁺ • 10 Methane )

By formula: (C₂H₅⁺ • 9CH₄) + CH₄ = (C₂H₅⁺ • 10CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.99	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

(C₃H₇⁺ • 7 Methane ) + Methane = (C₃H₇⁺ • 8 Methane )

By formula: (C₃H₇⁺ • 7CH₄) + CH₄ = (C₃H₇⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.28	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

(C₄H₉⁺ • 8 Methane ) + Methane = (C₄H₉⁺ • 9 Methane )

By formula: (C₄H₉⁺ • 8CH₄) + CH₄ = (C₄H₉⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.78	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

(CH₅⁺ • 8 Methane ) + Methane = (CH₅⁺ • 9 Methane )

By formula: (CH₅⁺ • 8CH₄) + CH₄ = (CH₅⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.44	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • H₂O) + CH₄ = (Co⁺ • CH₄ • H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	113.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(525 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
108. (+3.,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(525 K); M

( • Methane ) + Methane = ( • 2 Methane )

By formula: (H₃O⁺ • CH₄) + CH₄ = (H₃O⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.	kJ/mol	HPMS	Bennet and Field, 1972	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	34.	J/mol*K	HPMS	Bennet and Field, 1972	gas phase; Entropy change is questionable; M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • C₂H₆) + CH₄ = (Co⁺ • CH₄ • C₂H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	110.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(490 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
102. (+4.6,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(490 K); M

+ Methane = ( • Methane )

By formula: H₄N⁺ + CH₄ = (H₄N⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15.	kJ/mol	HPMS	Bennet and Field, 1972, 2	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	64.9	J/mol*K	HPMS	Bennet and Field, 1972, 2	gas phase; Entropy change is questionable; M

(g) + (cr) = Methane (g) + (cr)

By formula: HBr (g) + CH₃Li (cr) = CH₄ (g) + BrLi (cr)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-317.3 ± 2.0	kJ/mol	RSC	Holm, 1974	Please also see Pedley and Rylance, 1977. The reaction enthalpy was quoted from Pedley and Rylance, 1977. See Liebman, Martinho Simões, et al., 1995 for comments; MS

2 + = Methane + 2

By formula: 2H₂ + CH₂Cl₂ = CH₄ + 2HCl

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-163.4 ± 1.3	kJ/mol	Chyd	Lacher, Amador, et al., 1967	gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -167.7 ± 1.3 kJ/mol; At 250 C; ALS

(l) + ( • 100) (solution) = 2 Methane (g) + ( • 100) (solution)

By formula: C₂H₆Zn (l) + (H₂O₄S • 100H₂O) (solution) = 2CH₄ (g) + (O₄SZn • 100H₂O) (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-341.8 ± 0.8	kJ/mol	RSC	Carson, Hartley, et al., 1949	Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

(CH₅⁺ • 4 Methane ) + Methane = (CH₅⁺ • 5 Methane )

By formula: (CH₅⁺ • 4CH₄) + CH₄ = (CH₅⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.7 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	104.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 5 Methane ) + Methane = (CH₅⁺ • 6 Methane )

By formula: (CH₅⁺ • 5CH₄) + CH₄ = (CH₅⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.3 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	106.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 6 Methane ) + Methane = (CH₅⁺ • 7 Methane )

By formula: (CH₅⁺ • 6CH₄) + CH₄ = (CH₅⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.2 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	111.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 7 Methane ) + Methane = (CH₅⁺ • 8 Methane )

By formula: (CH₅⁺ • 7CH₄) + CH₄ = (CH₅⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	90.4	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(C₂H₅⁺ • 2 Methane ) + Methane = (C₂H₅⁺ • 3 Methane )

By formula: (C₂H₅⁺ • 2CH₄) + CH₄ = (C₂H₅⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.54	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	74.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 3 Methane ) + Methane = (C₂H₅⁺ • 4 Methane )

By formula: (C₂H₅⁺ • 3CH₄) + CH₄ = (C₂H₅⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.46	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	77.0	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 4 Methane ) + Methane = (C₂H₅⁺ • 5 Methane )

By formula: (C₂H₅⁺ • 4CH₄) + CH₄ = (C₂H₅⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.29	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	79.1	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 5 Methane ) + Methane = (C₂H₅⁺ • 6 Methane )

By formula: (C₂H₅⁺ • 5CH₄) + CH₄ = (C₂H₅⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.25	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 6 Methane ) + Methane = (C₂H₅⁺ • 7 Methane )

By formula: (C₂H₅⁺ • 6CH₄) + CH₄ = (C₂H₅⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.91	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	86.6	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 7 Methane ) + Methane = (C₂H₅⁺ • 8 Methane )

By formula: (C₂H₅⁺ • 7CH₄) + CH₄ = (C₂H₅⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.79	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 8 Methane ) + Methane = (C₂H₅⁺ • 9 Methane )

By formula: (C₂H₅⁺ • 8CH₄) + CH₄ = (C₂H₅⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.70	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 2 Methane ) + Methane = (C₃H₇⁺ • 3 Methane )

By formula: (C₃H₇⁺ • 2CH₄) + CH₄ = (C₃H₇⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.46	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	77.0	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 3 Methane ) + Methane = (C₃H₇⁺ • 4 Methane )

By formula: (C₃H₇⁺ • 3CH₄) + CH₄ = (C₃H₇⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.20	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	79.5	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 4 Methane ) + Methane = (C₃H₇⁺ • 5 Methane )

By formula: (C₃H₇⁺ • 4CH₄) + CH₄ = (C₃H₇⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.20	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 5 Methane ) + Methane = (C₃H₇⁺ • 6 Methane )

By formula: (C₃H₇⁺ • 5CH₄) + CH₄ = (C₃H₇⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.16	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 6 Methane ) + Methane = (C₃H₇⁺ • 7 Methane )

By formula: (C₃H₇⁺ • 6CH₄) + CH₄ = (C₃H₇⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.04	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 2 Methane ) + Methane = (C₄H₉⁺ • 3 Methane )

By formula: (C₄H₉⁺ • 2CH₄) + CH₄ = (C₄H₉⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.92	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 3 Methane ) + Methane = (C₄H₉⁺ • 4 Methane )

By formula: (C₄H₉⁺ • 3CH₄) + CH₄ = (C₄H₉⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.87	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	83.7	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 4 Methane ) + Methane = (C₄H₉⁺ • 5 Methane )

By formula: (C₄H₉⁺ • 4CH₄) + CH₄ = (C₄H₉⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.25	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 5 Methane ) + Methane = (C₄H₉⁺ • 6 Methane )

By formula: (C₄H₉⁺ • 5CH₄) + CH₄ = (C₄H₉⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.74	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	80.8	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 6 Methane ) + Methane = (C₄H₉⁺ • 7 Methane )

By formula: (C₄H₉⁺ • 6CH₄) + CH₄ = (C₄H₉⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.58	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 7 Methane ) + Methane = (C₄H₉⁺ • 8 Methane )

By formula: (C₄H₉⁺ • 7CH₄) + CH₄ = (C₄H₉⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.33	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.1	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

Henry's Law data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data compiled by: Rolf Sander

Henry's Law constant (water solution)

k_H(T) = k°_H exp(d(ln(k_H))/d(1/T) ((1/T) - 1/(298.15 K)))
k°_H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))
d(ln(k_H))/d(1/T) = Temperature dependence constant (K)

k°_H (mol/(kg*bar))	d(ln(k_H))/d(1/T) (K)	Method	Reference	Comment
0.0014	1600.	L	N/A	The parameterization given by missing citation (parameters A, B, C) doesn't fit the data in the same paper for this substance. Therefore the parameteriztaion of the solubility data (X₁) was recalculated.
0.0013	1900.	Q	N/A	Only the tabulated data between T = 273. K and T = 303. K from missing citation was used to derive k_H and -Δ k_H/R. Above T = 303. K the tabulated data could not be parameterized by equation (reference missing) very well. The partial pressure of water vapor (needed to convert some Henry's law constants) was calculated using the formula given by missing citation. The quantities A and α from missing citation were assumed to be identical.
0.0015		Q	N/A	missing citation give several references for the Henry's law constants but don't assign them to specific species.
0.0013		L	N/A
0.0013	1800.	X	N/A
0.0014	1700.	L	N/A
0.0015		V	N/A
0.00097		C	N/A
0.0014		R	N/A
0.0092		V	N/A

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to CH₄⁺ (ion structure unspecified)

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	12.61 ± 0.01	eV	N/A	N/A	L
Quantity	Value	Units	Method	Reference	Comment
Proton affinity (review)	543.5	kJ/mol	N/A	Hunter and Lias, 1998	HL
Quantity	Value	Units	Method	Reference	Comment
Gas basicity	520.6	kJ/mol	N/A	Hunter and Lias, 1998	HL

Ionization energy determinations

IE (eV)	Method	Reference	Comment
12.61 ± 0.01	PI	Berkowitz, Greene, et al., 1987	LBLHLM
12.6 ± 0.4	EI	Chatham, Hils, et al., 1984	LBLHLM
12.63 ± 0.02	EI	Plessis, Marmet, et al., 1983	LBLHLM
13.6	PE	Kimura, Katsumata, et al., 1981	LLK
12.75 ± 0.02	PE	Bieri, Burger, et al., 1977	LLK
12.82 ± 0.02	EI	Selim and El-Kholy, 1975	LLK
12.6	PE	Debies and Rabalais, 1975	LLK
12.6	PI	Rabalais, Debies, et al., 1974	LLK
12.8	EI	Morrison and Traeger, 1973	LLK
12.64	PE	Potts and Price, 1972	LLK
12.94 ± 0.04	EI	Finney and Harrison, 1972	LLK
12.51	PE	Bergmark, Rabalais, et al., 1972	LLK
~12.51	PE	Rabalais, Bergmark, et al., 1971	LLK
≤12.615 ± 0.010	PI	Chupka and Berkowitz, 1971	LLK
12.78	PE	Pullen, Carlson, et al., 1970	RDSH
12.75	PE	Brundle, Robin, et al., 1970	RDSH
≤12.70	EI	Lossing and Semeluk, 1969	RDSH
12.99 ± 0.05	EI	Williams and Hamill, 1968	RDSH
12.75 ± 0.05	TE	Villarejo, Stockbauer, et al., 1968	RDSH
12.9	CI	Cermak, 1968	RDSH
12.70	PE	Baker, Baker, et al., 1968	RDSH
12.55 ± 0.05	PI	Brehm, 1966	RDSH
12.704 ± 0.008	PI	Nicholson, 1965	RDSH
12.71 ± 0.02	PI	Dibeler, Krauss, et al., 1965	RDSH
13.00 ± 0.02	EI	Melton and Hamill, 1964	RDSH
13.6	PE	Bieri and Asbrink, 1980	Vertical value; LLK
13.6 ± 0.1	PE	Bieri, Burger, et al., 1977	Vertical value; LLK
13.60	EI	Harshbarger, Robin, et al., 1973	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
C⁺	25. ± 2.	?	EI	Chatham, Hils, et al., 1984	LBLHLM
C⁺	19.56 ± 0.20	2H₂	EI	Plessis, Marmet, et al., 1983	LBLHLM
C⁺	≤25.2	?	EI	Morrison and Traeger, 1973	LLK
CH⁺	22.2 ± 0.4	?	EI	Chatham, Hils, et al., 1984	LBLHLM
CH⁺	19.11 ± 0.20	H^-+H₂	EI	Plessis, Marmet, et al., 1983	LBLHLM
CH⁺	19.87 ± 0.20	H+H₂	EI	Plessis, Marmet, et al., 1983	LBLHLM
CH⁺	22.4	H₂+H?	EI	Morrison and Traeger, 1973	LLK
CH₂⁺	15.1 ± 0.4	H₂	EI	Chatham, Hils, et al., 1984	LBLHLM
CH₂⁺	15.06 ± 0.02	H₂	EI	Plessis, Marmet, et al., 1983	LBLHLM
CH₂⁺	15.16 ± 0.02	H₂	PI	McCulloh and Dibeler, 1976	T = 0K; LLK
CH₂⁺	15.3	H₂	EI	Morrison and Traeger, 1973	LLK
CH₂⁺	15.19 ± 0.02	H₂	PI	Chupka, 1968	RDSH
CH₂⁺	15.16 ± 0.04	H₂	PI	Dibeler, Krauss, et al., 1965	RDSH
CH₃⁺	14.3 ± 0.4	H	EI	Chatham, Hils, et al., 1984	LBLHLM
CH₃⁺	13.25 ± 0.08	H^-	EI	Plessis, Marmet, et al., 1983	LBLHLM
CH₃⁺	14.01 ± 0.08	H	EI	Plessis, Marmet, et al., 1983	LBLHLM
CH₃⁺	14.30	H	PIPECO	Stockbauer, 1977	LLK
CH₃⁺	14.324 ± 0.003	H	PI	McCulloh and Dibeler, 1976	T = 0K; LLK
CH₃⁺	14.4	H	EI	Morrison and Traeger, 1973	LLK
CH₃⁺	14.30	H	EI	Lossing and Semeluk, 1970	RDSH
CH₃⁺	14.24 ± 0.05	H	EI	Williams and Hamill, 1968	RDSH
CH₃⁺	13.50 ± 0.05	H^-	PI	Chupka, 1968	RDSH
CH₃⁺	14.320 ± 0.004	H	PI	Chupka, 1968	RDSH
CH₃⁺	14.23 ± 0.05	H	PI	Brehm, 1966	RDSH
CH₃⁺	14.25 ± 0.02	H	PI	Dibeler, Krauss, et al., 1965	RDSH
H⁺	21.3 ± 0.3	CH₃	EI	Locht, Olivier, et al., 1979	LLK
H⁺	24.0 ± 0.5	CH₃	EI	Appell and Kubach, 1971	LLK

De-protonation reactions

CH₃^- + = Methane

By formula: CH₃^- + H⁺ = CH₄

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1743.6 ± 2.9	kJ/mol	D-EA	Ellison, Engelking, et al., 1978	gas phase; B
Δ_rH°	1749. ± 15.	kJ/mol	CIDT	Graul and Squires, 1990	gas phase; B
Δ_rH°	>1691.1 ± 0.42	kJ/mol	G+TS	Bohme, Lee-Ruff, et al., 1972	gas phase; B
Δ_rH°	1735.5	kJ/mol	N/A	Check, Faust, et al., 2001	gas phase; FeBr3; ; ΔS(EA)=9.3; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1709.8 ± 3.3	kJ/mol	H-TS	Ellison, Engelking, et al., 1978	gas phase; B
Δ_rG°	1715. ± 15.	kJ/mol	H-TS	Graul and Squires, 1990	gas phase; B
Δ_rG°	>1657.3	kJ/mol	IMRB	Bohme, Lee-Ruff, et al., 1972	gas phase; B
Δ_rG°	1704.1	kJ/mol	N/A	Check, Faust, et al., 2001	gas phase; FeBr3; ; ΔS(EA)=9.3; B

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Mass spectrum (electron ionization), References, Notes

Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
RCD - Robert C. Dunbar

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

+ Methane = CH₄Br^-

By formula: Br^- + CH₄ = CH₄Br^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13.0	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-9.50	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

+ Methane = ( • Methane )

By formula: CF₃⁺ + CH₄ = (CF₃⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	19.	kJ/mol	HPMS	Bennet and Field, 1972, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	78.7	J/mol*K	HPMS	Bennet and Field, 1972, 2	gas phase; M

CH₄Cl^- + 2 Methane = C₂H₈Cl^-

By formula: CH₄Cl^- + 2CH₄ = C₂H₈Cl^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.6	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-12.8	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

CH₄F^- + 2 Methane = C₂H₈F^-

By formula: CH₄F^- + 2CH₄ = C₂H₈F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	24.7	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-1.5	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

CH₅⁺ + Methane = (CH₅⁺ • Methane )

By formula: CH₅⁺ + CH₄ = (CH₅⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	29. ± 1.	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	31.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rH°	17.	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.5	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	87.0	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rS°	51.9	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

(CH₅⁺ • Methane ) + Methane = (CH₅⁺ • 2 Methane )

By formula: (CH₅⁺ • CH₄) + CH₄ = (CH₅⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	22. ± 1.	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	25.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rH°	6.3	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	104.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	102.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rS°	30.	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

(CH₅⁺ • 2 Methane ) + Methane = (CH₅⁺ • 3 Methane )

By formula: (CH₅⁺ • 2CH₄) + CH₄ = (CH₅⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13.1 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	17.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	93.7	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	109.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M

(CH₅⁺ • 3 Methane ) + Methane = (CH₅⁺ • 4 Methane )

By formula: (CH₅⁺ • 3CH₄) + CH₄ = (CH₅⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.6 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	16.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	99.2	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	111.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M

(CH₅⁺ • 4 Methane ) + Methane = (CH₅⁺ • 5 Methane )

By formula: (CH₅⁺ • 4CH₄) + CH₄ = (CH₅⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.7 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	104.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 5 Methane ) + Methane = (CH₅⁺ • 6 Methane )

By formula: (CH₅⁺ • 5CH₄) + CH₄ = (CH₅⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.3 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	106.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 6 Methane ) + Methane = (CH₅⁺ • 7 Methane )

By formula: (CH₅⁺ • 6CH₄) + CH₄ = (CH₅⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.2 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	111.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 7 Methane ) + Methane = (CH₅⁺ • 8 Methane )

By formula: (CH₅⁺ • 7CH₄) + CH₄ = (CH₅⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	90.4	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 8 Methane ) + Methane = (CH₅⁺ • 9 Methane )

By formula: (CH₅⁺ • 8CH₄) + CH₄ = (CH₅⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.44	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M

C₂H₅⁺ + Methane = (C₂H₅⁺ • Methane )

By formula: C₂H₅⁺ + CH₄ = (C₂H₅⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	23.0	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rH°	28.	kJ/mol	PHPMS	Hiroka and Kebarle, 1975	gas phase; M
Δ_rH°	10.	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rS°	97.9	J/mol*K	PHPMS	Hiroka and Kebarle, 1975	gas phase; M
Δ_rS°	36.	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

(C₂H₅⁺ • Methane ) + Methane = (C₂H₅⁺ • 2 Methane )

By formula: (C₂H₅⁺ • CH₄) + CH₄ = (C₂H₅⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.92	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	67.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 2 Methane ) + Methane = (C₂H₅⁺ • 3 Methane )

By formula: (C₂H₅⁺ • 2CH₄) + CH₄ = (C₂H₅⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.54	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	74.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 3 Methane ) + Methane = (C₂H₅⁺ • 4 Methane )

By formula: (C₂H₅⁺ • 3CH₄) + CH₄ = (C₂H₅⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.46	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	77.0	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 4 Methane ) + Methane = (C₂H₅⁺ • 5 Methane )

By formula: (C₂H₅⁺ • 4CH₄) + CH₄ = (C₂H₅⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.29	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	79.1	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 5 Methane ) + Methane = (C₂H₅⁺ • 6 Methane )

By formula: (C₂H₅⁺ • 5CH₄) + CH₄ = (C₂H₅⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.25	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 6 Methane ) + Methane = (C₂H₅⁺ • 7 Methane )

By formula: (C₂H₅⁺ • 6CH₄) + CH₄ = (C₂H₅⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.91	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	86.6	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 7 Methane ) + Methane = (C₂H₅⁺ • 8 Methane )

By formula: (C₂H₅⁺ • 7CH₄) + CH₄ = (C₂H₅⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.79	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 8 Methane ) + Methane = (C₂H₅⁺ • 9 Methane )

By formula: (C₂H₅⁺ • 8CH₄) + CH₄ = (C₂H₅⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.70	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 9 Methane ) + Methane = (C₂H₅⁺ • 10 Methane )

By formula: (C₂H₅⁺ • 9CH₄) + CH₄ = (C₂H₅⁺ • 10CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.99	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

C₂H₈F^- + 3 Methane = C₃H₁₂F^-

By formula: C₂H₈F^- + 3CH₄ = C₃H₁₂F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	23.0	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-5.69	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₃H₇⁺ + Methane = (C₃H₇⁺ • Methane )

By formula: C₃H₇⁺ + CH₄ = (C₃H₇⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rH°	14.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1976	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	72.8	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rS°	84.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1976	gas phase; M

(C₃H₇⁺ • Methane ) + Methane = (C₃H₇⁺ • 2 Methane )

By formula: (C₃H₇⁺ • CH₄) + CH₄ = (C₃H₇⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.3	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	79.5	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 2 Methane ) + Methane = (C₃H₇⁺ • 3 Methane )

By formula: (C₃H₇⁺ • 2CH₄) + CH₄ = (C₃H₇⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.46	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	77.0	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 3 Methane ) + Methane = (C₃H₇⁺ • 4 Methane )

By formula: (C₃H₇⁺ • 3CH₄) + CH₄ = (C₃H₇⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.20	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	79.5	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 4 Methane ) + Methane = (C₃H₇⁺ • 5 Methane )

By formula: (C₃H₇⁺ • 4CH₄) + CH₄ = (C₃H₇⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.20	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 5 Methane ) + Methane = (C₃H₇⁺ • 6 Methane )

By formula: (C₃H₇⁺ • 5CH₄) + CH₄ = (C₃H₇⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.16	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 6 Methane ) + Methane = (C₃H₇⁺ • 7 Methane )

By formula: (C₃H₇⁺ • 6CH₄) + CH₄ = (C₃H₇⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.04	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 7 Methane ) + Methane = (C₃H₇⁺ • 8 Methane )

By formula: (C₃H₇⁺ • 7CH₄) + CH₄ = (C₃H₇⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.28	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

C₃H₁₂F^- + 4 Methane = C₄H₁₆F^-

By formula: C₃H₁₂F^- + 4CH₄ = C₄H₁₆F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	20.9	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-9.04	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₄H₉⁺ + Methane = (C₄H₉⁺ • Methane )

By formula: C₄H₉⁺ + CH₄ = (C₄H₉⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.4	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.6	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • Methane ) + Methane = (C₄H₉⁺ • 2 Methane )

By formula: (C₄H₉⁺ • CH₄) + CH₄ = (C₄H₉⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.0	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 2 Methane ) + Methane = (C₄H₉⁺ • 3 Methane )

By formula: (C₄H₉⁺ • 2CH₄) + CH₄ = (C₄H₉⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.92	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 3 Methane ) + Methane = (C₄H₉⁺ • 4 Methane )

By formula: (C₄H₉⁺ • 3CH₄) + CH₄ = (C₄H₉⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.87	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	83.7	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 4 Methane ) + Methane = (C₄H₉⁺ • 5 Methane )

By formula: (C₄H₉⁺ • 4CH₄) + CH₄ = (C₄H₉⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.25	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 5 Methane ) + Methane = (C₄H₉⁺ • 6 Methane )

By formula: (C₄H₉⁺ • 5CH₄) + CH₄ = (C₄H₉⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.74	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	80.8	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 6 Methane ) + Methane = (C₄H₉⁺ • 7 Methane )

By formula: (C₄H₉⁺ • 6CH₄) + CH₄ = (C₄H₉⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.58	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 7 Methane ) + Methane = (C₄H₉⁺ • 8 Methane )

By formula: (C₄H₉⁺ • 7CH₄) + CH₄ = (C₄H₉⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.33	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.1	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 8 Methane ) + Methane = (C₄H₉⁺ • 9 Methane )

By formula: (C₄H₉⁺ • 8CH₄) + CH₄ = (C₄H₉⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.78	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

C₄H₁₆F^- + 5 Methane = C₅H₂₀F^-

By formula: C₄H₁₆F^- + 5CH₄ = C₅H₂₀F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	18.8	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-12.3	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₅H₂₀F^- + 6 Methane = C₆H₂₄F^-

By formula: C₅H₂₀F^- + 6CH₄ = C₆H₂₄F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	17.6	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-13.6	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₅MnO₅⁺ + Methane = (C₅MnO₅⁺ • Methane )

By formula: C₅MnO₅⁺ + CH₄ = (C₅MnO₅⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	30.	kJ/mol	ICRCD	Hop and McMahon, 1991	gas phase; Ar collision gas, Δ_rH<; M

C₆H₂₄F^- + 7 Methane = C₇H₂₈F^-

By formula: C₆H₂₄F^- + 7CH₄ = C₇H₂₈F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13.8	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-12.4	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₇H₂₈F^- + 8 Methane = C₈H₃₂F^-

By formula: C₇H₂₈F^- + 8CH₄ = C₈H₃₂F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.1	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-15.3	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₈H₃₂F^- + 9 Methane = C₉H₃₆F^-

By formula: C₈H₃₂F^- + 9CH₄ = C₉H₃₆F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.62	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-16.6	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₉H₃₆F^- + 10 Methane = C₁₀H₄₀F^-

By formula: C₉H₃₆F^- + 10CH₄ = C₁₀H₄₀F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.53	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-17.4	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

+ Methane = CH₄Cl^-

By formula: Cl^- + CH₄ = CH₄Cl^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15.9	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-9.04	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

+ Methane = ( • Methane )

By formula: Co⁺ + CH₄ = (Co⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.8	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(530 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	Method	Reference	Comment
90.0 (+6.7,-0.)	CID	Haynes and Armentrout, 1996	gas phase; guided ion beam CID; M
90.0 (+5.9,-0.)	CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M
94. (+2.,-0.)	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(530 K); M

( • Methane ) + Methane = ( • 2 Methane )

By formula: (Co⁺ • CH₄) + CH₄ = (Co⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	109.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(500 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
95.8 (+5.0,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M
104. (+4.2,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(500 K); M

( • 2 Methane ) + Methane = ( • 3 Methane )

By formula: (Co⁺ • 2CH₄) + CH₄ = (Co⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	46.	kJ/mol	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
41. (+5.0,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
3.	477.	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M

( • 3 Methane ) + Methane = ( • 4 Methane )

By formula: (Co⁺ • 3CH₄) + CH₄ = (Co⁺ • 4CH₄)

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
67.8 (+5.9,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • C₂H₆) + CH₄ = (Co⁺ • CH₄ • C₂H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	110.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(490 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
102. (+4.6,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(490 K); M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • H₂O) + CH₄ = (Co⁺ • CH₄ • H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	113.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(525 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
108. (+3.,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(525 K); M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • H₂) + CH₄ = (Co⁺ • CH₄ • H₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+)2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
94.6 (+5.0,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+)2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

+ Methane = CH₄F^-

By formula: F^- + CH₄ = CH₄F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	28.0	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	6.82	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

+ Methane = ( • Methane )

By formula: Fe⁺ + CH₄ = (Fe⁺ • CH₄)

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
57. (+3.,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

( • Methane ) + Methane = ( • 2 Methane )

By formula: (Fe⁺ • CH₄) + CH₄ = (Fe⁺ • 2CH₄)

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
97.1 (+4.2,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

( • 2 Methane ) + Methane = ( • 3 Methane )

By formula: (Fe⁺ • 2CH₄) + CH₄ = (Fe⁺ • 3CH₄)

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
99.2 (+5.9,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

( • 3 Methane ) + Methane = ( • 4 Methane )

By formula: (Fe⁺ • 3CH₄) + CH₄ = (Fe⁺ • 4CH₄)

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
74.1 (+5.9,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

+ Methane = ( • Methane )

By formula: H₃O⁺ + CH₄ = (H₃O⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	33.	kJ/mol	HPMS	Bennet and Field, 1972	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	85.4	J/mol*K	HPMS	Bennet and Field, 1972	gas phase; M

( • Methane ) + Methane = ( • 2 Methane )

By formula: (H₃O⁺ • CH₄) + CH₄ = (H₃O⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.	kJ/mol	HPMS	Bennet and Field, 1972	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	34.	J/mol*K	HPMS	Bennet and Field, 1972	gas phase; Entropy change is questionable; M

H₃S⁺ + Methane = (H₃S⁺ • Methane )

By formula: H₃S⁺ + CH₄ = (H₃S⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.	kJ/mol	HPMS	Bennet and Field, 1972, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	75.7	J/mol*K	HPMS	Bennet and Field, 1972, 2	gas phase; M

+ Methane = ( • Methane )

By formula: H₄N⁺ + CH₄ = (H₄N⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15.	kJ/mol	HPMS	Bennet and Field, 1972, 2	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	64.9	J/mol*K	HPMS	Bennet and Field, 1972, 2	gas phase; Entropy change is questionable; M

+ Methane = CH₄I^-

By formula: I^- + CH₄ = CH₄I^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.9	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-11.6	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

+ Methane = ( • Methane )

By formula: Mg⁺ + CH₄ = (Mg⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	28. ± 6.7	kJ/mol	CIDT	Andersen, Muntean, et al., 2000	RCD

( • Methane ) + Methane = ( • 2 Methane )

By formula: (Mg⁺ • CH₄) + CH₄ = (Mg⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15. ± 6.7	kJ/mol	CIDT	Andersen, Muntean, et al., 2000	RCD

+ Methane = ( • Methane )

By formula: Na⁺ + CH₄ = (Na⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	30.	kJ/mol	HPMS	Castleman, Peterson, et al., 1983	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	59.0	J/mol*K	HPMS	Castleman, Peterson, et al., 1983	gas phase; M

Mass spectrum (electron ionization)

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, References, Notes

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Additional Data

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Owner	NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.
Origin	D.HENNEBERG, MAX-PLANCK INSTITUTE, MULHEIM, WEST GERMANY
NIST MS number	61313

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References

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Notes

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Plessis, P.; Marmet, P.; Dutil, R., Ionization and appearance potentials of CH₄ by electron impact, J. Phys. B:, 1983, 16, 1283. [all data]

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Kimura, K.; Katsumata, S.; Achiba, Y.; Yamazaki, T.; Iwata, S., Ionization energies, Ab initio assignments, and valence electronic structure for 200 molecules in Handbook of HeI Photoelectron Spectra of Fundamental Organic Compounds, Japan Scientific Soc. Press, Tokyo, 1981. [all data]

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Bieri, G.; Burger, F.; Heilbronner, E.; Maier, J.P., Valence ionization enrgies of hydrocarbons, Helv. Chim. Acta, 1977, 60, 2213. [all data]

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Debies and Rabalais, 1975
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Rabalais, Debies, et al., 1974
Rabalais, J.W.; Debies, T.P.; Berkosky, J.L.; Huang, J.-T.J.; Ellison, F.O., Calculated photoionization cross sections relative experimental photoionization intensities for a selection of small molecules, J. Chem. Phys., 1974, 61, 516. [all data]

Morrison and Traeger, 1973
Morrison, J.D.; Traeger, J.C., Ionization and dissociation by electron impact. III. CH₄ and SiH₄, Int. J. Mass Spectrom. Ion Phys., 1973, 11, 289. [all data]

Potts and Price, 1972
Potts, A.W.; Price, W.C., The photoelectron spectra of methane, silane germane and stannane, Proc. R. Soc. London A:, 1972, 165. [all data]

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Notes

Symbols used in this document:

AE	Appearance energy
C_p,gas	Constant pressure heat capacity of gas
IE (evaluated)	Recommended ionization energy
P_c	Critical pressure
P_triple	Triple point pressure
S°_gas	Entropy of gas at standard conditions
S°_{gas,1 bar}	Entropy of gas at standard conditions (1 bar)
T	Temperature
T_boil	Boiling point
T_c	Critical temperature
T_fus	Fusion (melting) point
T_triple	Triple point temperature
V_c	Critical volume
d(ln(k_H))/d(1/T)	Temperature dependence parameter for Henry's Law constant
k°_H	Henry's Law constant at 298.15K
ΔH_trs	Enthalpy of phase transition
ΔS_trs	Entropy of phase transition
Δ_cH°_gas	Enthalpy of combustion of gas at standard conditions
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions
Δ_rS°	Entropy of reaction at standard conditions
Δ_subH	Enthalpy of sublimation
Δ_vapH	Enthalpy of vaporization
Δ_vapS	Entropy of vaporization
ρ_c	Critical density

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
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Methane

Data at NIST subscription sites:

Gas phase thermochemistry data

Constant pressure heat capacity of gas

Constant pressure heat capacity of gas

Gas Phase Heat Capacity (Shomate Equation)

Phase change data

Enthalpy of vaporization

Enthalpy of vaporization

Entropy of vaporization

Antoine Equation Parameters

Enthalpy of sublimation

Enthalpy of phase transition

Entropy of phase transition

Reaction thermochemistry data

Reactions 1 to 50

Enthalpy of reaction

Free energy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Henry's Law data

Henry's Law constant (water solution)

Gas phase ion energetics data

Ionization energy determinations

Appearance energy determinations

De-protonation reactions

Ion clustering data

Clustering reactions

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Free energy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Mass spectrum (electron ionization)

Spectrum

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Notes