Methane

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Gas phase thermochemistry data

Go To: Top, 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:
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
Δfgas-74.87kJ/molReviewChase, 1998Data last reviewed in March, 1961
Δfgas-74.6 ± 0.3kJ/molReviewManion, 2002adopted recommendation of Gurvich, Veyts, et al., 1991; DRB
Δfgas-74.5 ± 0.4kJ/molCcbPittam and Pilcher, 1972ALS
Δfgas-74.85 ± 0.31kJ/molCcbProsen and Rossini, 1945Hf derived from Heat of Hydrogenation; ALS
Δfgas-73.4 ± 1.1kJ/molCcbRoth and Banse, 1932Reanalyzed by Cox and Pilcher, 1970, Original value = -75.19 kJ/mol; ALS
Quantity Value Units Method Reference Comment
Δcgas-890.7 ± 0.4kJ/molCcbPittam and Pilcher, 1972Corresponding Δfgas = -74.48 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Δcgas-890.35 ± 0.30kJ/molCcbProsen and Rossini, 1945Hf derived from Heat of Hydrogenation; Corresponding Δfgas = -74.822 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Δcgas-891.8 ± 1.1kJ/molCcbRoth and Banse, 1932Reanalyzed by Cox and Pilcher, 1970, Original value = -887.3 ± 1.0 kJ/mol; Corresponding Δfgas = -73.39 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Δcgas-890.16 ± 0.30kJ/molCmRossini, 1931Corresponding Δfgas = -75.010 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Quantity Value Units Method Reference Comment
gas188.66 ± 0.42J/mol*KN/AColwell J.H., 1963The 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
gas,1 bar186.25J/mol*KReviewChase, 1998Data last reviewed in March, 1961

Constant pressure heat capacity of gas

Cp,gas (J/mol*K) Temperature (K) Reference Comment
34.92 ± 0.25279.Halford J.O., 1957GT

Constant pressure heat capacity of gas

Cp,gas (J/mol*K) Temperature (K) Reference Comment
33.28100.Gurvich, Veyts, et al., 1989p=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
33.51200.
35.69298.15
35.76300.
40.63400.
46.63500.
52.74600.
58.60700.
64.08800.
69.14900.
73.751000.
77.921100.
81.681200.
85.071300.
88.111400.
90.861500.
93.331600.
95.581700.
97.631800.
99.511900.
101.242000.
102.832100.
104.312200.
105.702300.
107.002400.
108.232500.
109.392600.
110.502700.
111.562800.
112.572900.
113.553000.

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 -0.70302985.81217
B 108.477311.26467
C -42.52157-2.114146
D 5.8627880.138190
E 0.678565-26.42221
F -76.84376-153.5327
G 158.7163224.4143
H -74.87310-74.87310
ReferenceChase, 1998Chase, 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, 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- + Hydrogen cation = Methane

By formula: CH3- + H+ = CH4

Quantity Value Units Method Reference Comment
Δr1743.6 ± 2.9kJ/molD-EAEllison, Engelking, et al., 1978gas phase; B
Δr1749. ± 15.kJ/molCIDTGraul and Squires, 1990gas phase; B
Δr>1691.1 ± 0.42kJ/molG+TSBohme, Lee-Ruff, et al., 1972gas phase; B
Δr1735.5kJ/molN/ACheck, Faust, et al., 2001gas phase; FeBr3; ; ΔS(EA)=9.3; B
Quantity Value Units Method Reference Comment
Δr1709.8 ± 3.3kJ/molH-TSEllison, Engelking, et al., 1978gas phase; B
Δr1715. ± 15.kJ/molH-TSGraul and Squires, 1990gas phase; B
Δr>1657.3kJ/molIMRBBohme, Lee-Ruff, et al., 1972gas phase; B
Δr1704.1kJ/molN/ACheck, Faust, et al., 2001gas phase; FeBr3; ; ΔS(EA)=9.3; B

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

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

Quantity Value Units Method Reference Comment
Δr22. ± 1.kJ/molPHPMSHiraoka and Mori, 1989gas phase; M
Δr25.kJ/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Δr6.3kJ/molHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Δr104.J/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Δr102.J/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M
Δr30.J/mol*KHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M

CH5+ + Methane = (CH5+ • Methane)

By formula: CH5+ + CH4 = (CH5+ • CH4)

Quantity Value Units Method Reference Comment
Δr29. ± 1.kJ/molPHPMSHiraoka and Mori, 1989gas phase; M
Δr31.kJ/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Δr17.kJ/molHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Δr92.5J/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Δr87.0J/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M
Δr51.9J/mol*KHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M

C2H5+ + Methane = (C2H5+ • Methane)

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

Quantity Value Units Method Reference Comment
Δr23.0kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Δr28.kJ/molPHPMSHiroka and Kebarle, 1975gas phase; M
Δr10.kJ/molHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Δr92.9J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M
Δr97.9J/mol*KPHPMSHiroka and Kebarle, 1975gas phase; M
Δr36.J/mol*KHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M

(Cobalt ion (1+) • 2Methane) + Methane = (Cobalt ion (1+) • 3Methane)

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

Quantity Value Units Method Reference Comment
Δr46.kJ/molSIDTKemper, Bushnell, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr84.J/mol*KN/AKemper, Bushnell, et al., 1993gas phase; Entropy change calculated or estimated; M

Enthalpy of reaction

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

Free energy of reaction

ΔrG° (kJ/mol) T (K) Method Reference Comment
3.477.SIDTKemper, Bushnell, et al., 1993gas phase; Entropy change calculated or estimated; M

Cobalt ion (1+) + Methane = (Cobalt ion (1+) • Methane)

By formula: Co+ + CH4 = (Co+ • CH4)

Quantity Value Units Method Reference Comment
Δr82.8J/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrS(530 K); M

Enthalpy of reaction

ΔrH° (kJ/mol) T (K) Method Reference Comment
90.0 (+6.7,-0.) CIDHaynes and Armentrout, 1996gas phase; guided ion beam CID; M
90.0 (+5.9,-0.) CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID; M
94. (+2.,-0.) SIDTKemper, Bushnell, et al., 1993gas phase; ΔrS(530 K); M

(Cobalt ion (1+) • Methane) + Hydrogen = (Cobalt ion (1+) • Hydrogen • Methane)

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

Quantity Value Units Method Reference Comment
Δr95.8J/mol*KSIDTKemper, Bushnell, et al., 1993gas 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.) SIDTKemper, Bushnell, et al., 1993gas phase; switching reaction(Co+).2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993, 2; M

(Cobalt ion (1+) • Hydrogen) + Methane = (Cobalt ion (1+) • Methane • Hydrogen)

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

Quantity Value Units Method Reference Comment
Δr91.2J/mol*KSIDTKemper, Bushnell, et al., 1993gas 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.) SIDTKemper, Bushnell, et al., 1993gas phase; switching reaction(Co+)2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993, 2; M

Manganese, pentacarbonylmethyl- (g) = C5MnO5 (g) + Methane (g)

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

Quantity Value Units Method Reference Comment
Δr192. ± 15.kJ/molPIMSMartinho Simões and Beauchamp, 1990The 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

(Cobalt ion (1+) • Methane) + Methane = (Cobalt ion (1+) • 2Methane)

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

Quantity Value Units Method Reference Comment
Δr109.J/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrS(500 K); M

Enthalpy of reaction

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

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

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

Quantity Value Units Method Reference Comment
Δr13.1 ± 0.8kJ/molPHPMSHiraoka and Mori, 1989gas phase; M
Δr17.kJ/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Quantity Value Units Method Reference Comment
Δr93.7J/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Δr109.J/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr12.6 ± 0.8kJ/molPHPMSHiraoka and Mori, 1989gas phase; M
Δr16.kJ/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Quantity Value Units Method Reference Comment
Δr99.2J/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Δr111.J/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr-274.5 ± 2.2kJ/molRSCHolm, 1981solvent: 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

(Cobalt ion (1+) • Methane) + Ethane = (Cobalt ion (1+) • Ethane • Methane)

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

Quantity Value Units Method Reference Comment
Δr108.J/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; switching reaction(Co+).2CH4, ΔrS(480 K); M

Enthalpy of reaction

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

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

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

Quantity Value Units Method Reference Comment
Δr155. ± 13.kJ/molKinSMartin and Finke, 1990solvent: Ethylene glycol; Please also see Martin and Finke, 1992. The reaction enthalpy relies on 172. ± 13. kJ/mol for the reaction activation enthalpy. The reaction refers to "base-on" cobalamine.; MS

C3H7+ + Methane = (C3H7+ • Methane)

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

Quantity Value Units Method Reference Comment
Δr10.8kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Δr14.kJ/molPHPMSHiraoka and Kebarle, 1976gas phase; M
Quantity Value Units Method Reference Comment
Δr72.8J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M
Δr84.J/mol*KPHPMSHiraoka and Kebarle, 1976gas phase; M

Hydrogen iodide + Methane, iodo- = Methane + Iodine

By formula: HI + CH3I = CH4 + I2

Quantity Value Units Method Reference Comment
Δr-52.55 ± 0.54kJ/molEqkGolden, Walsh, et al., 1965gas phase; ALS
Δr-53.0 ± 0.2kJ/molEqkGoy and Pritchard, 1965gas phase; ALS
Δr-46.2 ± 5.6kJ/molCmNichol and Ubbelohde, 1952gas phase; ALS

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

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

Quantity Value Units Method Reference Comment
Δr7.99kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr92.J/mol*KN/AHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M

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

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

Quantity Value Units Method Reference Comment
Δr8.28kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr92.J/mol*KN/AHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M

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

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

Quantity Value Units Method Reference Comment
Δr7.78kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr84.J/mol*KN/AHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M

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

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

Quantity Value Units Method Reference Comment
Δr6.44kJ/molPHPMSHiraoka and Mori, 1989gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr84.J/mol*KN/AHiraoka and Mori, 1989gas phase; Entropy change calculated or estimated; M

(Cobalt ion (1+) • Water) + Methane = (Cobalt ion (1+) • Methane • Water)

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

Quantity Value Units Method Reference Comment
Δr113.J/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrS(525 K); M

Enthalpy of reaction

ΔrH° (kJ/mol) T (K) Method Reference Comment
108. (+3.,-0.) SIDTKemper, Bushnell, et al., 1993gas phase; ΔrS(525 K); M

(Hydronium cation • Methane) + Methane = (Hydronium cation • 2Methane)

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

Quantity Value Units Method Reference Comment
Δr14.kJ/molHPMSBennet and Field, 1972gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Δr34.J/mol*KHPMSBennet and Field, 1972gas phase; Entropy change is questionable; M

(Cobalt ion (1+) • Ethane) + Methane = (Cobalt ion (1+) • Methane • Ethane)

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

Quantity Value Units Method Reference Comment
Δr110.J/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrS(490 K); M

Enthalpy of reaction

ΔrH° (kJ/mol) T (K) Method Reference Comment
102. (+4.6,-0.) SIDTKemper, Bushnell, et al., 1993gas phase; ΔrS(490 K); M

NH4+ + Methane = (NH4+ • Methane)

By formula: H4N+ + CH4 = (H4N+ • CH4)

Quantity Value Units Method Reference Comment
Δr15.kJ/molHPMSBennet and Field, 1972, 2gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Δr64.9J/mol*KHPMSBennet and Field, 1972, 2gas phase; Entropy change is questionable; M

Hydrogen bromide (g) + methyllithium (cr) = Methane (g) + Lithium bromide (cr)

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

Quantity Value Units Method Reference Comment
Δr-317.3 ± 2.0kJ/molRSCHolm, 1974Please 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

2Hydrogen + Methylene chloride = Methane + 2Hydrogen chloride

By formula: 2H2 + CH2Cl2 = CH4 + 2HCl

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

Dimethylzinc (l) + (Sulfuric Acid • 100Water) (solution) = 2Methane (g) + (zinc sulphate • 100Water) (solution)

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

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

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

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

Quantity Value Units Method Reference Comment
Δr11.7 ± 0.8kJ/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Δr104.J/mol*KPHPMSHiraoka and Mori, 1989gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr11.3 ± 0.8kJ/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Δr106.J/mol*KPHPMSHiraoka and Mori, 1989gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr11.2 ± 0.8kJ/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Δr111.J/mol*KPHPMSHiraoka and Mori, 1989gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr8.5 ± 0.8kJ/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Δr90.4J/mol*KPHPMSHiraoka and Mori, 1989gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.54kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr74.9J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.46kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr77.0J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.29kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr79.1J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.25kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr81.2J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr8.91kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr86.6J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr8.79kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr87.9J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr8.70kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr91.2J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.46kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr77.0J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.20kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr79.5J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.20kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr87.4J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.16kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr87.9J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.04kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr91.2J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.92kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr82.4J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.87kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr83.7J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr9.25kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr81.2J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr8.74kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr80.8J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr8.58kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr82.4J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Δr8.33kJ/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr84.1J/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, 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 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 ± 0.01eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)543.5kJ/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity520.6kJ/molN/AHunter and Lias, 1998HL

Ionization energy determinations

IE (eV) Method Reference Comment
12.61 ± 0.01PIBerkowitz, Greene, et al., 1987LBLHLM
12.6 ± 0.4EIChatham, Hils, et al., 1984LBLHLM
12.63 ± 0.02EIPlessis, Marmet, et al., 1983LBLHLM
13.6PEKimura, Katsumata, et al., 1981LLK
12.75 ± 0.02PEBieri, Burger, et al., 1977LLK
12.82 ± 0.02EISelim and El-Kholy, 1975LLK
12.6PEDebies and Rabalais, 1975LLK
12.6PIRabalais, Debies, et al., 1974LLK
12.8EIMorrison and Traeger, 1973LLK
12.64PEPotts and Price, 1972LLK
12.94 ± 0.04EIFinney and Harrison, 1972LLK
12.51PEBergmark, Rabalais, et al., 1972LLK
~12.51PERabalais, Bergmark, et al., 1971LLK
≤12.615 ± 0.010PIChupka and Berkowitz, 1971LLK
12.78PEPullen, Carlson, et al., 1970RDSH
12.75PEBrundle, Robin, et al., 1970RDSH
≤12.70EILossing and Semeluk, 1969RDSH
12.99 ± 0.05EIWilliams and Hamill, 1968RDSH
12.75 ± 0.05TEVillarejo, Stockbauer, et al., 1968RDSH
12.9CICermak, 1968RDSH
12.70PEBaker, Baker, et al., 1968RDSH
12.55 ± 0.05PIBrehm, 1966RDSH
12.704 ± 0.008PINicholson, 1965RDSH
12.71 ± 0.02PIDibeler, Krauss, et al., 1965RDSH
13.00 ± 0.02EIMelton and Hamill, 1964RDSH
13.6PEBieri and Asbrink, 1980Vertical value; LLK
13.6 ± 0.1PEBieri, Burger, et al., 1977Vertical value; LLK
13.60EIHarshbarger, Robin, et al., 1973Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C+25. ± 2.?EIChatham, Hils, et al., 1984LBLHLM
C+19.56 ± 0.202H2EIPlessis, Marmet, et al., 1983LBLHLM
C+≤25.2?EIMorrison and Traeger, 1973LLK
CH+22.2 ± 0.4?EIChatham, Hils, et al., 1984LBLHLM
CH+19.11 ± 0.20H-+H2EIPlessis, Marmet, et al., 1983LBLHLM
CH+19.87 ± 0.20H+H2EIPlessis, Marmet, et al., 1983LBLHLM
CH+22.4H2+H?EIMorrison and Traeger, 1973LLK
CH2+15.1 ± 0.4H2EIChatham, Hils, et al., 1984LBLHLM
CH2+15.06 ± 0.02H2EIPlessis, Marmet, et al., 1983LBLHLM
CH2+15.16 ± 0.02H2PIMcCulloh and Dibeler, 1976T = 0K; LLK
CH2+15.3H2EIMorrison and Traeger, 1973LLK
CH2+15.19 ± 0.02H2PIChupka, 1968RDSH
CH2+15.16 ± 0.04H2PIDibeler, Krauss, et al., 1965RDSH
CH3+14.3 ± 0.4HEIChatham, Hils, et al., 1984LBLHLM
CH3+13.25 ± 0.08H-EIPlessis, Marmet, et al., 1983LBLHLM
CH3+14.01 ± 0.08HEIPlessis, Marmet, et al., 1983LBLHLM
CH3+14.30HPIPECOStockbauer, 1977LLK
CH3+14.324 ± 0.003HPIMcCulloh and Dibeler, 1976T = 0K; LLK
CH3+14.4HEIMorrison and Traeger, 1973LLK
CH3+14.30HEILossing and Semeluk, 1970RDSH
CH3+14.24 ± 0.05HEIWilliams and Hamill, 1968RDSH
CH3+13.50 ± 0.05H-PIChupka, 1968RDSH
CH3+14.320 ± 0.004HPIChupka, 1968RDSH
CH3+14.23 ± 0.05HPIBrehm, 1966RDSH
CH3+14.25 ± 0.02HPIDibeler, Krauss, et al., 1965RDSH
H+21.3 ± 0.3CH3EILocht, Olivier, et al., 1979LLK
H+24.0 ± 0.5CH3EIAppell and Kubach, 1971LLK

De-protonation reactions

CH3- + Hydrogen cation = Methane

By formula: CH3- + H+ = CH4

Quantity Value Units Method Reference Comment
Δr1743.6 ± 2.9kJ/molD-EAEllison, Engelking, et al., 1978gas phase; B
Δr1749. ± 15.kJ/molCIDTGraul and Squires, 1990gas phase; B
Δr>1691.1 ± 0.42kJ/molG+TSBohme, Lee-Ruff, et al., 1972gas phase; B
Δr1735.5kJ/molN/ACheck, Faust, et al., 2001gas phase; FeBr3; ; ΔS(EA)=9.3; B
Quantity Value Units Method Reference Comment
Δr1709.8 ± 3.3kJ/molH-TSEllison, Engelking, et al., 1978gas phase; B
Δr1715. ± 15.kJ/molH-TSGraul and Squires, 1990gas phase; B
Δr>1657.3kJ/molIMRBBohme, Lee-Ruff, et al., 1972gas phase; B
Δr1704.1kJ/molN/ACheck, Faust, et al., 2001gas phase; FeBr3; ; ΔS(EA)=9.3; B

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics 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

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