Methane
- Formula: CH4
- Molecular weight: 16.0425
- IUPAC Standard InChI:
- InChI=1S/CH4/h1H4
- Download the identifier in a file.
- 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)
- Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Other data available:
- Reaction thermochemistry data: reactions 51 to 100, reactions 101 to 112
- Henry's Law data
- Gas phase ion energetics data
- Ion clustering data
- Fluid Properties
- Data at other public NIST sites:
- Options:
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Gas phase thermochemistry data
Go To: Top, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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 |
---|---|---|---|---|---|
![]() | -74.87 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1961 |
![]() | -74.6 ± 0.3 | kJ/mol | Review | Manion, 2002 | adopted recommendation of Gurvich, Veyts, et al., 1991; DRB |
![]() | -74.5 ± 0.4 | kJ/mol | Ccb | Pittam and Pilcher, 1972 | ALS |
![]() | -74.85 ± 0.31 | kJ/mol | Ccb | Prosen and Rossini, 1945 | Hf derived from Heat of Hydrogenation; ALS |
![]() | -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 |
![]() | -890.7 ± 0.4 | kJ/mol | Ccb | Pittam and Pilcher, 1972 | Corresponding «DELTA»fHºgas = -74.48 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
![]() | -890.35 ± 0.30 | kJ/mol | Ccb | Prosen and Rossini, 1945 | Hf derived from Heat of Hydrogenation; Corresponding «DELTA»fHºgas = -74.822 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
![]() | -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 «DELTA»fHºgas = -73.39 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
![]() | -890.16 ± 0.30 | kJ/mol | Cm | Rossini, 1931 | Corresponding «DELTA»fHºgas = -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/mol*K, 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/mol*K 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
Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
34.92 ± 0.25 | 279. | Halford J.O., 1957 | GT |
Constant pressure heat capacity of gas
Cp,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)
Cp° = 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
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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Temperature (K) | 298. - 1300. | 1300. - 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, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Kenneth Kroenlein director
DH - Eugene S. Domalski and Elizabeth D. Hearing
AC - William E. Acree, Jr., James S. Chickos
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 111. ± 2. | K | AVG | N/A | Average of 13 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 85.7 | K | N/A | Streng, 1971 | Uncertainty assigned by TRC = 0.2 K; TRC |
Tfus | 90.6 | K | N/A | Van't Zelfde, Omar, et al., 1968 | Uncertainty assigned by TRC = 0.3 K; TRC |
Tfus | 91.2 | K | N/A | Timmermans, 1935 | Uncertainty assigned by TRC = 2. K; TRC |
Tfus | 90.6 | K | N/A | Clusius, 1929 | Uncertainty assigned by TRC = 0.2 K; TRC |
Tfus | 90.5 | K | N/A | Eucken and Karwat, 1924 | Uncertainty assigned by TRC = 0.2 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 90.67 ± 0.03 | K | AVG | N/A | Average of 25 out of 32 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Ptriple | 0.1169 ± 0.0006 | bar | AVG | N/A | Average of 20 out of 23 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 190.6 ± 0.3 | K | AVG | N/A | Average of 19 out of 23 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 46.1 ± 0.3 | bar | AVG | N/A | Average of 16 out of 21 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Vc | 0.09860 | l/mol | N/A | Ambrose and Tsonopoulos, 1995 | |
Vc | 0.09852 | l/mol | N/A | Younglove and Ely, 1987 | TRC |
Vc | 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 |
![]() | 10.1 ± 0.2 | mol/l | AVG | N/A | Average of 16 out of 17 values; Individual data points |
Enthalpy of vaporization
![]() |
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. - 110. K. See also Boublik, Fried, et al., 1984.; AC |
8.6 | 105. | A | Stephenson and Malanowski, 1987 | Based on data from 90. - 120. K.; AC |
8.4 | 134. | A | Stephenson and Malanowski, 1987 | Based on data from 115. - 149. K.; AC |
8.7 | 174. | A | Stephenson and Malanowski, 1987 | Based on data from 148. - 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. - 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. - 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. - 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. - 189. K.; AC |
8.5 ± 0.1 | 99. | N/A | Frank and Clusius, 1939 | AC |
Enthalpy of vaporization
ΔvapH = A exp(-αTr)
(1 − Tr)β
ΔvapH =
Enthalpy of vaporization (at saturation pressure)
(kJ/mol)
Tr = reduced temperature (T / Tc)
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Temperature (K) | 112. - 180. |
---|---|
A (kJ/mol) | 10.11 |
![]() |
-0.22 |
![]() |
0.388 |
Tc (K) | 190.6 |
Reference | Majer and Svoboda, 1985 |
Entropy of vaporization
![]() |
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 - 189.99 | 3.9895 | 443.028 | -0.49 | Prydz and Goodwin, 1972 | Coefficents calculated by NIST from author's data. |
96.89 - 110.19 | 2.00253 | 125.819 | -48.823 | Regnier, 1972 | Coefficents calculated by NIST from author's data. |
93.04 - 107.84 | 3.80235 | 403.106 | -5.479 | Cutler and Morrison, 1965 | Coefficents calculated by NIST from author's data. |
110.00 - 190.5 | 4.22061 | 516.689 | 11.223 | Hestermans and White, 1961 | Coefficents calculated by NIST from author's data. |
Enthalpy of sublimation
![]() |
Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
9.7 | 72. | N/A | Stephenson and Malanowski, 1987 | Based on data from 53. - 91. K.; AC |
9.2 | 72. | N/A | Bondi, 1963 | Based on data from 54. - 90. K. See also Armstrong, Brickwedde, et al., 1955.; AC |
10.0 | 84. | N/A | Jones, 1960 | Based on data from 79. - 89. K.; AC |
9.7 | 63. | A,MS | Tickner and Lossing, 1951 | Based on data from 48. - 78. K.; AC |
9.62 | 77. | A | Stull, 1947 | Based on data from 67. - 88. K.; AC |
Enthalpy of phase transition
![]() |
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
![]() |
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 |
Reaction thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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- + =
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 1743.6 ± 2.9 | kJ/mol | D-EA | Ellison, Engelking, et al., 1978 | gas phase; B |
![]() | 1749. ± 15. | kJ/mol | CIDT | Graul and Squires, 1990 | gas phase; B |
![]() | >1691.1 ± 0.42 | kJ/mol | G+TS | Bohme, Lee-Ruff, et al., 1972 | gas phase; B |
![]() | 1735.5 | kJ/mol | N/A | Check, Faust, et al., 2001 | gas phase; FeBr3; ; «DELTA»S(EA)=9.3; B |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 1709.8 ± 3.3 | kJ/mol | H-TS | Ellison, Engelking, et al., 1978 | gas phase; B |
![]() | 1715. ± 15. | kJ/mol | H-TS | Graul and Squires, 1990 | gas phase; B |
![]() | >1657.3 | kJ/mol | IMRB | Bohme, Lee-Ruff, et al., 1972 | gas phase; B |
![]() | 1704.1 | kJ/mol | N/A | Check, Faust, et al., 2001 | gas phase; FeBr3; ; «DELTA»S(EA)=9.3; B |
By formula: (CH5+ CH4) + CH4 = (CH5+
2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 22. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
![]() | 25. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
![]() | 6.3 | kJ/mol | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 104. | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
![]() | 102. | J/mol*K | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
![]() | 30. | J/mol*K | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
By formula: CH5+ + CH4 = (CH5+ CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 29. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
![]() | 31. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
![]() | 17. | kJ/mol | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 92.5 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
![]() | 87.0 | J/mol*K | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
![]() | 51.9 | J/mol*K | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
By formula: C2H5+ + CH4 = (C2H5+ CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 23.0 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
![]() | 28. | kJ/mol | PHPMS | Hiroka and Kebarle, 1975 | gas phase; M |
![]() | 10. | kJ/mol | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 92.9 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
![]() | 97.9 | J/mol*K | PHPMS | Hiroka and Kebarle, 1975 | gas phase; M |
![]() | 36. | J/mol*K | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
By formula: (Co+ 2CH4) + CH4 = (Co+
3CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 46. | kJ/mol | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 84. | J/mol*K | N/A | Kemper, Bushnell, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Enthalpy of reaction
![]() |
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
![]() |
T (K) | Method | Reference | Comment |
---|---|---|---|---|
3. | 477. | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
By formula: Co+ + CH4 = (Co+ CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 82.8 | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; «DELTA»rS(530 K); M |
Enthalpy of reaction
![]() |
T (K) | 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; «DELTA»rS(530 K); M |
By formula: (Co+ CH4) + H2 = (Co+
H2
CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 95.8 | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+).2H2, «DELTA»rS(440 K); Kemper, Bushnell, et al., 1993, 2; M |
Enthalpy of reaction
![]() |
T (K) | Method | Reference | Comment |
---|---|---|---|---|
73. (+3.,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+).2H2, «DELTA»rS(440 K); Kemper, Bushnell, et al., 1993, 2; M |
By formula: (Co+ H2) + CH4 = (Co+
CH4
H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 91.2 | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+)2H2, «DELTA»rS(440 K); Kemper, Bushnell, et al., 1993, 2; M |
Enthalpy of reaction
![]() |
T (K) | Method | Reference | Comment |
---|---|---|---|---|
94.6 (+5.0,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+)2H2, «DELTA»rS(440 K); Kemper, Bushnell, et al., 1993, 2; M |
(g) = C5MnO5 (g) +
(g)
By formula: C6H3MnO5 (g) = C5MnO5 (g) + CH4 (g)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 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 |
By formula: (Co+ CH4) + CH4 = (Co+
2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 109. | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; «DELTA»rS(500 K); M |
Enthalpy of reaction
![]() |
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; «DELTA»rS(500 K); M |
By formula: (CH5+ 2CH4) + CH4 = (CH5+
3CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 13.1 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
![]() | 17. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 93.7 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
![]() | 109. | J/mol*K | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
By formula: (CH5+ 3CH4) + CH4 = (CH5+
4CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 12.6 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
![]() | 16. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 99.2 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
![]() | 111. | J/mol*K | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
(g) + CH3BrMg (solution) =
(solution) + Br2Mg (solution)
By formula: HBr (g) + CH3BrMg (solution) = CH4 (solution) + Br2Mg (solution)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | -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 |
By formula: (Co+ CH4) + C2H6 = (Co+
C2H6
CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 108. | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+).2CH4, «DELTA»rS(480 K); M |
Enthalpy of reaction
![]() |
T (K) | Method | Reference | Comment |
---|---|---|---|---|
119. (+5.4,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+).2CH4, «DELTA»rS(480 K); M |
C63H91CoN13O14P (solution) = (solution) +
(solution)
By formula: C63H91CoN13O14P (solution) = C63H88CoN14O14P (solution) + CH4 (solution)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 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 |
By formula: C3H7+ + CH4 = (C3H7+ CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 10.8 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
![]() | 14. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1976 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 72.8 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
![]() | 84. | J/mol*K | PHPMS | Hiraoka and Kebarle, 1976 | gas phase; M |
By formula: HI + CH3I = CH4 + I2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | -52.55 ± 0.54 | kJ/mol | Eqk | Golden, Walsh, et al., 1965 | gas phase; ALS |
![]() | -53.0 ± 0.2 | kJ/mol | Eqk | Goy and Pritchard, 1965 | gas phase; ALS |
![]() | -46.2 ± 5.6 | kJ/mol | Cm | Nichol and Ubbelohde, 1952 | gas phase; ALS |
By formula: (C2H5+ 9CH4) + CH4 = (C2H5+
10CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 7.99 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 92. | J/mol*K | N/A | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
By formula: (C3H7+ 7CH4) + CH4 = (C3H7+
8CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 8.28 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 92. | J/mol*K | N/A | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
By formula: (C4H9+ 8CH4) + CH4 = (C4H9+
9CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 7.78 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 84. | J/mol*K | N/A | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
By formula: (CH5+ 8CH4) + CH4 = (CH5+
9CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 6.44 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 84. | J/mol*K | N/A | Hiraoka and Mori, 1989 | gas phase; Entropy change calculated or estimated; M |
By formula: (Co+ H2O) + CH4 = (Co+
CH4
H2O)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 113. | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; «DELTA»rS(525 K); M |
Enthalpy of reaction
![]() |
T (K) | Method | Reference | Comment |
---|---|---|---|---|
108. (+3.,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; «DELTA»rS(525 K); M |
By formula: (H3O+ CH4) + CH4 = (H3O+
2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 14. | kJ/mol | HPMS | Bennet and Field, 1972 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 34. | J/mol*K | HPMS | Bennet and Field, 1972 | gas phase; Entropy change is questionable; M |
By formula: (Co+ C2H6) + CH4 = (Co+
CH4
C2H6)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 110. | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; «DELTA»rS(490 K); M |
Enthalpy of reaction
![]() |
T (K) | Method | Reference | Comment |
---|---|---|---|---|
102. (+4.6,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; «DELTA»rS(490 K); M |
By formula: H4N+ + CH4 = (H4N+ CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 15. | kJ/mol | HPMS | Bennet and Field, 1972, 2 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 64.9 | J/mol*K | HPMS | Bennet and Field, 1972, 2 | gas phase; Entropy change is questionable; M |
By formula: HBr (g) + CH3Li (cr) = CH4 (g) + BrLi (cr)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | -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 |
By formula: 2H2 + CH2Cl2 = CH4 + 2HCl
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | -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
(g) + (
100
) (solution)
By formula: C2H6Zn (l) + (H2O4S 100H2O) (solution) = 2CH4 (g) + (O4SZn
100H2O) (solution)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | -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 |
By formula: (CH5+ 4CH4) + CH4 = (CH5+
5CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 11.7 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 104. | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
By formula: (CH5+ 5CH4) + CH4 = (CH5+
6CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 11.3 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 106. | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
By formula: (CH5+ 6CH4) + CH4 = (CH5+
7CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 11.2 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 111. | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
By formula: (CH5+ 7CH4) + CH4 = (CH5+
8CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 8.5 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 90.4 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
By formula: (C2H5+ 2CH4) + CH4 = (C2H5+
3CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.54 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 74.9 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C2H5+ 3CH4) + CH4 = (C2H5+
4CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.46 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 77.0 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C2H5+ 4CH4) + CH4 = (C2H5+
5CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.29 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 79.1 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C2H5+ 5CH4) + CH4 = (C2H5+
6CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.25 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 81.2 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C2H5+ 6CH4) + CH4 = (C2H5+
7CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 8.91 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 86.6 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C2H5+ 7CH4) + CH4 = (C2H5+
8CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 8.79 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 87.9 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C2H5+ 8CH4) + CH4 = (C2H5+
9CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 8.70 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 91.2 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C3H7+ 2CH4) + CH4 = (C3H7+
3CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.46 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 77.0 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C3H7+ 3CH4) + CH4 = (C3H7+
4CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.20 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 79.5 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C3H7+ 4CH4) + CH4 = (C3H7+
5CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.20 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 87.4 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C3H7+ 5CH4) + CH4 = (C3H7+
6CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.16 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 87.9 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C3H7+ 6CH4) + CH4 = (C3H7+
7CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.04 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 91.2 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C4H9+ 2CH4) + CH4 = (C4H9+
3CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.92 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 82.4 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C4H9+ 3CH4) + CH4 = (C4H9+
4CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.87 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 83.7 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C4H9+ 4CH4) + CH4 = (C4H9+
5CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 9.25 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 81.2 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C4H9+ 5CH4) + CH4 = (C4H9+
6CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 8.74 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 80.8 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C4H9+ 6CH4) + CH4 = (C4H9+
7CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 8.58 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 82.4 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C4H9+ 7CH4) + CH4 = (C4H9+
8CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
![]() | 8.33 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
![]() | 84.1 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
IR Spectrum
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, References, Notes
Data compiled by: Coblentz Society, Inc.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Mass spectrum (electron ionization)
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Vibrational and/or electronic energy levels, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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 |
Vibrational and/or electronic energy levels
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Takehiko Shimanouchi
Symmetry: Td Symmetry Number
= 12
Sym. | No | Approximate | Selected Freq. | Infrared | Raman | Comments | ||||
---|---|---|---|---|---|---|---|---|---|---|
Species | type of mode | Value | Rating | Value | Phase | Value | Phase | |||
a1 | 1 | Sym str | 2917 | A | ia | 2917.0 | gas | |||
e | 2 | Deg deform | 1534 | A | 1533 ia | gas | 1533.6 | Observed through Coriolis interaction with «nu»4 | ||
f2 | 3 | Deg str | 3019 | A | 3018.9 | gas | 3019.5 | |||
f2 | 4 | Deg deform | 1306 | C | 1306.2 | gas | ||||
Source: Shimanouchi, 1972
Notes
ia | Inactive |
A | 0~1 cm-1 uncertainty |
C | 3~6 cm-1 uncertainty |
References
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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Entropy and heat capacity of methane; spin-species conversion,
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Thermophysical properties of methane,
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Thermodynamic functions of methane,
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Entropy and heat capacity of methane, spin-species conversion,
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Dampfdrucktafeln für Temperaturbestimmungen zwischen + 25° und - 185°,
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. [all data]
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Notes
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, References
- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas Pc Critical pressure Ptriple 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 Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point Ttriple Triple point temperature Vc Critical volume Htrs
Enthalpy of phase transition Strs
Entropy of phase transition cH°gas
Enthalpy of combustion of gas at standard conditions fH°gas
Enthalpy of formation of gas at standard conditions rG°
Free energy of reaction at standard conditions rH°
Enthalpy of reaction at standard conditions rS°
Entropy of reaction at standard conditions subH
Enthalpy of sublimation vapH
Enthalpy of vaporization vapS
Entropy of vaporization c
Critical density - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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