Methane
- Formula: CH4
- Molecular weight: 16.0425
- 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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Gas phase thermochemistry data
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, 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 |
---|---|---|---|---|---|
ΔfH°gas | -74.87 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1961 |
ΔfH°gas | -74.6 ± 0.3 | kJ/mol | Review | Manion, 2002 | adopted recommendation of Gurvich, Veyts, et al., 1991; DRB |
ΔfH°gas | -74.5 ± 0.4 | kJ/mol | Ccb | Pittam and Pilcher, 1972 | ALS |
ΔfH°gas | -74.85 ± 0.31 | kJ/mol | Ccb | Prosen and Rossini, 1945 | Hf derived from Heat of Hydrogenation; ALS |
ΔfH°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 |
ΔcH°gas | -890.7 ± 0.4 | kJ/mol | Ccb | Pittam and Pilcher, 1972 | Corresponding ΔfHºgas = -74.48 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
ΔcH°gas | -890.35 ± 0.30 | kJ/mol | Ccb | Prosen and Rossini, 1945 | Hf derived from Heat of Hydrogenation; Corresponding ΔfHºgas = -74.822 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
ΔcH°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 ΔfHºgas = -73.39 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
ΔcH°gas | -890.16 ± 0.30 | kJ/mol | Cm | Rossini, 1931 | Corresponding ΔfHºgas = -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. 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 |
Reaction thermochemistry data
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, 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 |
---|---|---|---|---|---|
ΔrH° | 1743.6 ± 2.9 | kJ/mol | D-EA | Ellison, Engelking, et al., 1978 | gas phase; B |
ΔrH° | 1749. ± 15. | kJ/mol | CIDT | Graul and Squires, 1990 | gas phase; B |
ΔrH° | >1691.1 ± 0.42 | kJ/mol | G+TS | Bohme, Lee-Ruff, et al., 1972 | gas phase; B |
ΔrH° | 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 |
ΔrG° | 1709.8 ± 3.3 | kJ/mol | H-TS | Ellison, Engelking, et al., 1978 | gas phase; B |
ΔrG° | 1715. ± 15. | kJ/mol | H-TS | Graul and Squires, 1990 | gas phase; B |
ΔrG° | >1657.3 | kJ/mol | IMRB | Bohme, Lee-Ruff, et al., 1972 | gas phase; B |
ΔrG° | 1704.1 | kJ/mol | N/A | Check, Faust, et al., 2001 | gas phase; FeBr3; ; ΔS(EA)=9.3; B |
By formula: (CH5+ • CH4) + CH4 = (CH5+ • 2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 22. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrH° | 25. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
ΔrH° | 6.3 | kJ/mol | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 104. | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrS° | 102. | J/mol*K | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 29. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrH° | 31. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
ΔrH° | 17. | kJ/mol | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 92.5 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrS° | 87.0 | J/mol*K | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 23.0 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
ΔrH° | 28. | kJ/mol | PHPMS | Hiroka and Kebarle, 1975 | gas phase; M |
ΔrH° | 10. | kJ/mol | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 92.9 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
ΔrS° | 97.9 | J/mol*K | PHPMS | Hiroka and Kebarle, 1975 | gas phase; M |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 46. | kJ/mol | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 84. | J/mol*K | N/A | Kemper, Bushnell, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Enthalpy of reaction
ΔrH° (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
ΔrG° (kJ/mol) | 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 |
---|---|---|---|---|---|
ΔrS° | 82.8 | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(530 K); M |
Enthalpy of reaction
ΔrH° (kJ/mol) | 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; ΔrS(530 K); M |
By formula: (Co+ • CH4) + H2 = (Co+ • H2 • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrS° | 95.8 | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+).2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993, 2; M |
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
73. (+3.,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+).2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993, 2; M |
By formula: (Co+ • H2) + CH4 = (Co+ • CH4 • H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrS° | 91.2 | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+)2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993, 2; M |
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
94.6 (+5.0,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+)2H2, ΔrS(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 |
---|---|---|---|---|---|
ΔrH° | 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 |
---|---|---|---|---|---|
ΔrS° | 109. | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(500 K); M |
Enthalpy of reaction
ΔrH° (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; ΔrS(500 K); M |
By formula: (CH5+ • 2CH4) + CH4 = (CH5+ • 3CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 13.1 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrH° | 17. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 93.7 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 12.6 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrH° | 16. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 99.2 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | -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 |
---|---|---|---|---|---|
ΔrS° | 108. | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+).2CH4, ΔrS(480 K); M |
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
119. (+5.4,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+).2CH4, ΔrS(480 K); M |
C63H91CoN13O14P (solution) = (solution) +
(solution)
By formula: C63H91CoN13O14P (solution) = C63H88CoN14O14P (solution) + CH4 (solution)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 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 |
---|---|---|---|---|---|
ΔrH° | 10.8 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
ΔrH° | 14. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1976 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 72.8 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
ΔrS° | 84. | J/mol*K | PHPMS | Hiraoka and Kebarle, 1976 | gas phase; M |
By formula: HI + CH3I = CH4 + I2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -52.55 ± 0.54 | kJ/mol | Eqk | Golden, Walsh, et al., 1965 | gas phase; ALS |
ΔrH° | -53.0 ± 0.2 | kJ/mol | Eqk | Goy and Pritchard, 1965 | gas phase; ALS |
ΔrH° | -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 |
---|---|---|---|---|---|
ΔrH° | 7.99 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.28 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 7.78 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 6.44 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrS° | 113. | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(525 K); M |
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
108. (+3.,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(525 K); M |
By formula: (H3O+ • CH4) + CH4 = (H3O+ • 2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 14. | kJ/mol | HPMS | Bennet and Field, 1972 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrS° | 110. | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(490 K); M |
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
102. (+4.6,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(490 K); M |
By formula: H4N+ + CH4 = (H4N+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15. | kJ/mol | HPMS | Bennet and Field, 1972, 2 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | -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 |
---|---|---|---|---|---|
ΔrH° | -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 |
---|---|---|---|---|---|
ΔrH° | -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 |
---|---|---|---|---|---|
ΔrH° | 11.7 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 11.3 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 11.2 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.5 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.54 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.46 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.29 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.25 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.91 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.79 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.70 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.46 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.20 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.20 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.16 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.04 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.92 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.87 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.25 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.74 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.58 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.33 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 84.1 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Ion clustering data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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
Appearance energy determinations
De-protonation reactions
CH3- + =
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 1743.6 ± 2.9 | kJ/mol | D-EA | Ellison, Engelking, et al., 1978 | gas phase; B |
ΔrH° | 1749. ± 15. | kJ/mol | CIDT | Graul and Squires, 1990 | gas phase; B |
ΔrH° | >1691.1 ± 0.42 | kJ/mol | G+TS | Bohme, Lee-Ruff, et al., 1972 | gas phase; B |
ΔrH° | 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 |
ΔrG° | 1709.8 ± 3.3 | kJ/mol | H-TS | Ellison, Engelking, et al., 1978 | gas phase; B |
ΔrG° | 1715. ± 15. | kJ/mol | H-TS | Graul and Squires, 1990 | gas phase; B |
ΔrG° | >1657.3 | kJ/mol | IMRB | Bohme, Lee-Ruff, et al., 1972 | gas phase; B |
ΔrG° | 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, Reaction thermochemistry data, Gas phase ion energetics data, 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
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
+
= CH4Br-
By formula: Br- + CH4 = CH4Br-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 13.0 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -9.50 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: CF3+ + CH4 = (CF3+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 19. | kJ/mol | HPMS | Bennet and Field, 1972, 2 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 78.7 | J/mol*K | HPMS | Bennet and Field, 1972, 2 | gas phase; M |
By formula: CH4Cl- + 2CH4 = C2H8Cl-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 14.6 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -12.8 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: CH4F- + 2CH4 = C2H8F-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 24.7 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -1.5 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: CH5+ + CH4 = (CH5+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 29. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrH° | 31. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
ΔrH° | 17. | kJ/mol | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 92.5 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrS° | 87.0 | J/mol*K | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
ΔrS° | 51.9 | J/mol*K | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
By formula: (CH5+ • CH4) + CH4 = (CH5+ • 2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 22. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrH° | 25. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
ΔrH° | 6.3 | kJ/mol | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 104. | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrS° | 102. | J/mol*K | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
ΔrS° | 30. | J/mol*K | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
By formula: (CH5+ • 2CH4) + CH4 = (CH5+ • 3CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 13.1 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrH° | 17. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 93.7 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 12.6 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrH° | 16. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 99.2 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
ΔrS° | 111. | J/mol*K | PHPMS | Hiraoka and Kebarle, 1975 | gas phase; M |
By formula: (CH5+ • 4CH4) + CH4 = (CH5+ • 5CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 11.7 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 11.3 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 11.2 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.5 ± 0.8 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 90.4 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase; M |
By formula: (CH5+ • 8CH4) + CH4 = (CH5+ • 9CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 6.44 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 84. | J/mol*K | N/A | Hiraoka and Mori, 1989 | gas phase; Entropy change calculated or estimated; M |
By formula: C2H5+ + CH4 = (C2H5+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 23.0 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
ΔrH° | 28. | kJ/mol | PHPMS | Hiroka and Kebarle, 1975 | gas phase; M |
ΔrH° | 10. | kJ/mol | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 92.9 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
ΔrS° | 97.9 | J/mol*K | PHPMS | Hiroka and Kebarle, 1975 | gas phase; M |
ΔrS° | 36. | J/mol*K | HPMS | Field and Beggs, 1971 | gas phase; Entropy change is questionable; M |
By formula: (C2H5+ • CH4) + CH4 = (C2H5+ • 2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 9.92 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 67.4 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C2H5+ • 2CH4) + CH4 = (C2H5+ • 3CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 9.54 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.46 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.29 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.25 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.91 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.79 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.70 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 91.2 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C2H5+ • 9CH4) + CH4 = (C2H5+ • 10CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 7.99 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 92. | J/mol*K | N/A | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
By formula: C2H8F- + 3CH4 = C3H12F-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 23.0 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -5.69 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: C3H7+ + CH4 = (C3H7+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 10.8 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
ΔrH° | 14. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1976 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 72.8 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
ΔrS° | 84. | J/mol*K | PHPMS | Hiraoka and Kebarle, 1976 | gas phase; M |
By formula: (C3H7+ • CH4) + CH4 = (C3H7+ • 2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 10.3 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 79.5 | 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 |
---|---|---|---|---|---|
ΔrH° | 9.46 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.20 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.20 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.16 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.04 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 91.2 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C3H7+ • 7CH4) + CH4 = (C3H7+ • 8CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 8.28 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 92. | J/mol*K | N/A | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
By formula: C3H12F- + 4CH4 = C4H16F-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 20.9 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -9.04 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: C4H9+ + CH4 = (C4H9+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 10.4 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 81.6 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C4H9+ • CH4) + CH4 = (C4H9+ • 2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 10.0 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 81.2 | 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 |
---|---|---|---|---|---|
ΔrH° | 9.92 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.87 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 9.25 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.74 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.58 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 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 |
---|---|---|---|---|---|
ΔrH° | 8.33 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 84.1 | J/mol*K | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; M |
By formula: (C4H9+ • 8CH4) + CH4 = (C4H9+ • 9CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 7.78 | kJ/mol | PHPMS | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 84. | J/mol*K | N/A | Hiraoka, Mori, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
By formula: C4H16F- + 5CH4 = C5H20F-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 18.8 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -12.3 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: C5H20F- + 6CH4 = C6H24F-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 17.6 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -13.6 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: C5MnO5+ + CH4 = (C5MnO5+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 30. | kJ/mol | ICRCD | Hop and McMahon, 1991 | gas phase; Ar collision gas, ΔrH<; M |
By formula: C6H24F- + 7CH4 = C7H28F-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 13.8 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -12.4 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: C7H28F- + 8CH4 = C8H32F-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 12.1 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -15.3 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: C8H32F- + 9CH4 = C9H36F-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 9.62 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -16.6 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: C9H36F- + 10CH4 = C10H40F-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 7.53 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -17.4 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
+
= CH4Cl-
By formula: Cl- + CH4 = CH4Cl-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15.9 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -9.04 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: Co+ + CH4 = (Co+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrS° | 82.8 | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(530 K); M |
Enthalpy of reaction
ΔrH° (kJ/mol) | 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; ΔrS(530 K); M |
By formula: (Co+ • CH4) + CH4 = (Co+ • 2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrS° | 109. | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(500 K); M |
Enthalpy of reaction
ΔrH° (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; ΔrS(500 K); M |
By formula: (Co+ • 2CH4) + CH4 = (Co+ • 3CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 46. | kJ/mol | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 84. | J/mol*K | N/A | Kemper, Bushnell, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
Enthalpy of reaction
ΔrH° (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
ΔrG° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
3. | 477. | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; Entropy change calculated or estimated; M |
By formula: (Co+ • 3CH4) + CH4 = (Co+ • 4CH4)
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
67.8 (+5.9,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: (Co+ • C2H6) + CH4 = (Co+ • CH4 • C2H6)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrS° | 110. | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(490 K); M |
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
102. (+4.6,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(490 K); M |
By formula: (Co+ • H2O) + CH4 = (Co+ • CH4 • H2O)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrS° | 113. | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(525 K); M |
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
108. (+3.,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; ΔrS(525 K); M |
By formula: (Co+ • H2) + CH4 = (Co+ • CH4 • H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrS° | 91.2 | J/mol*K | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+)2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993, 2; M |
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
94.6 (+5.0,-0.) | SIDT | Kemper, Bushnell, et al., 1993 | gas phase; switching reaction(Co+)2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993, 2; M |
+
= CH4F-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 28.0 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 6.82 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: Fe+ + CH4 = (Fe+ • CH4)
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
57. (+3.,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: (Fe+ • CH4) + CH4 = (Fe+ • 2CH4)
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
97.1 (+4.2,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: (Fe+ • 2CH4) + CH4 = (Fe+ • 3CH4)
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
99.2 (+5.9,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: (Fe+ • 3CH4) + CH4 = (Fe+ • 4CH4)
Enthalpy of reaction
ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
74.1 (+5.9,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: H3O+ + CH4 = (H3O+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 33. | kJ/mol | HPMS | Bennet and Field, 1972 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 85.4 | J/mol*K | HPMS | Bennet and Field, 1972 | gas phase; M |
By formula: (H3O+ • CH4) + CH4 = (H3O+ • 2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 14. | kJ/mol | HPMS | Bennet and Field, 1972 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 34. | J/mol*K | HPMS | Bennet and Field, 1972 | gas phase; Entropy change is questionable; M |
By formula: H3S+ + CH4 = (H3S+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 16. | kJ/mol | HPMS | Bennet and Field, 1972, 2 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 75.7 | J/mol*K | HPMS | Bennet and Field, 1972, 2 | gas phase; M |
By formula: H4N+ + CH4 = (H4N+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15. | kJ/mol | HPMS | Bennet and Field, 1972, 2 | gas phase; Entropy change is questionable; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 64.9 | J/mol*K | HPMS | Bennet and Field, 1972, 2 | gas phase; Entropy change is questionable; M |
+
= CH4I-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 10.9 | kJ/mol | N/A | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | -11.6 | kJ/mol | TDAs | Hiraoka, Mizuno, et al., 2001 | gas phase; B |
By formula: Mg+ + CH4 = (Mg+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 28. ± 6.7 | kJ/mol | CIDT | Andersen, Muntean, et al., 2000 | RCD |
By formula: (Mg+ • CH4) + CH4 = (Mg+ • 2CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15. ± 6.7 | kJ/mol | CIDT | Andersen, Muntean, et al., 2000 | RCD |
By formula: Na+ + CH4 = (Na+ • CH4)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 30. | kJ/mol | HPMS | Castleman, Peterson, et al., 1983 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 59.0 | J/mol*K | HPMS | Castleman, Peterson, et al., 1983 | gas phase; M |
References
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, 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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Notes
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, References
- Symbols used in this document:
AE Appearance energy Cp,gas Constant pressure heat capacity of gas IE (evaluated) Recommended ionization energy S°gas Entropy of gas at standard conditions S°gas,1 bar Entropy of gas at standard conditions (1 bar) T Temperature ΔcH°gas Enthalpy of combustion of gas at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions ΔrS° Entropy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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