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, 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, 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 |
References
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry 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, References
- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas 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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