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Methane

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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
Deltafgas-17.89kcal/molReviewChase, 1998Data last reviewed in March, 1961
Deltafgas-17.8 ± 0.07kcal/molReviewManion, 2002adopted recommendation of Gurvich, Veyts, et al., 1991; DRB
Deltafgas-17.8 ± 0.1kcal/molCcbPittam and Pilcher, 1972ALS
Deltafgas-17.889 ± 0.075kcal/molCcbProsen and Rossini, 1945Hf derived from Heat of Hydrogenation; ALS
Deltafgas-17.54 ± 0.26kcal/molCcbRoth and Banse, 1932Reanalyzed by Cox and Pilcher, 1970, Original value = -17.97 kcal/mol; ALS
Quantity Value Units Method Reference Comment
Deltacgas-212.88 ± 0.09kcal/molCcbPittam and Pilcher, 1972Corresponding «DELTA»fgas = -17.80 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS
Deltacgas-212.798 ± 0.072kcal/molCcbProsen and Rossini, 1945Hf derived from Heat of Hydrogenation; Corresponding «DELTA»fgas = -17.883 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS
Deltacgas-213.14 ± 0.26kcal/molCcbRoth and Banse, 1932Reanalyzed by Cox and Pilcher, 1970, Original value = -212.07 ± 0.25 kcal/mol; Corresponding «DELTA»fgas = -17.54 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS
Deltacgas-212.753 ± 0.072kcal/molCmRossini, 1931Corresponding «DELTA»fgas = -17.928 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS
Quantity Value Units Method Reference Comment
gas45.09 ± 0.10cal/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 bar44.515cal/mol*KReviewChase, 1998Data last reviewed in March, 1961

Constant pressure heat capacity of gas

Cp,gas (cal/mol*K) Temperature (K) Reference Comment
8.346 ± 0.060279.Halford J.O., 1957GT

Constant pressure heat capacity of gas

Cp,gas (cal/mol*K) Temperature (K) Reference Comment
7.954100.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
8.009200.
8.530298.15
8.547300.
9.711400.
11.14500.
12.61600.
14.01700.
15.32800.
16.52900.
17.631000.
18.621100.
19.521200.
20.331300.
21.061400.
21.721500.
22.311600.
22.841700.
23.331800.
23.781900.
24.1972000.
24.5772100.
24.9312200.
25.2632300.
25.5742400.
25.8682500.
26.1452600.
26.4102700.
26.6632800.
26.9052900.
27.1393000.

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 (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. - 1300.1300. - 6000.
A -0.16802820.50960
B 25.926702.692321
C -10.16290-0.505293
D 1.4012400.033028
E 0.162181-6.315060
F -18.36610-36.69520
G 37.9341153.63631
H -17.89510-17.89510
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, 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
Deltar416.74 ± 0.70kcal/molD-EAEllison, Engelking, et al., 1978gas phase; B
Deltar418.0 ± 3.5kcal/molCIDTGraul and Squires, 1990gas phase; B
Deltar>404.18 ± 0.10kcal/molG+TSBohme, Lee-Ruff, et al., 1972gas phase; B
Deltar414.80kcal/molN/ACheck, Faust, et al., 2001gas phase; FeBr3; ; «DELTA»S(EA)=9.3; B
Quantity Value Units Method Reference Comment
Deltar408.66 ± 0.80kcal/molH-TSEllison, Engelking, et al., 1978gas phase; B
Deltar409.9 ± 3.6kcal/molH-TSGraul and Squires, 1990gas phase; B
Deltar>396.10kcal/molIMRBBohme, Lee-Ruff, et al., 1972gas phase; B
Deltar407.30kcal/molN/ACheck, Faust, et al., 2001gas phase; FeBr3; ; «DELTA»S(EA)=9.3; B

(CH5+ bullet Methane) + Methane = (CH5+ bullet 2Methane)

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

Quantity Value Units Method Reference Comment
Deltar5.3 ± 0.3kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Deltar5.9kcal/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Deltar1.5kcal/molHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Deltar24.9cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Deltar24.4cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M
Deltar7.2cal/mol*KHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M

CH5+ + Methane = (CH5+ bullet Methane)

By formula: CH5+ + CH4 = (CH5+ bullet CH4)

Quantity Value Units Method Reference Comment
Deltar6.9 ± 0.3kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Deltar7.4kcal/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Deltar4.1kcal/molHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Deltar22.1cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Deltar20.8cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M
Deltar12.4cal/mol*KHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M

C2H5+ + Methane = (C2H5+ bullet Methane)

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

Quantity Value Units Method Reference Comment
Deltar5.50kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Deltar6.6kcal/molPHPMSHiroka and Kebarle, 1975gas phase; M
Deltar2.4kcal/molHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Deltar22.2cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M
Deltar23.4cal/mol*KPHPMSHiroka and Kebarle, 1975gas phase; M
Deltar8.6cal/mol*KHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M

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

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

Quantity Value Units Method Reference Comment
Deltar11.kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Deltar20.cal/mol*KN/AKemper, Bushnell, et al., 1993gas phase; Entropy change calculated or estimated; M

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
9.8 (+1.2,-0.) CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID; M

Free energy of reaction

DeltarG° (kcal/mol) T (K) Method Reference Comment
0.7477.SIDTKemper, Bushnell, et al., 1993gas phase; Entropy change calculated or estimated; M

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

By formula: Co+ + CH4 = (Co+ bullet CH4)

Quantity Value Units Method Reference Comment
Deltar19.8cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; «DELTA»rS(530 K); M

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
21.5 (+1.6,-0.) CIDHaynes and Armentrout, 1996gas phase; guided ion beam CID; M
21.5 (+1.4,-0.) CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID; M
22.5 (+0.5,-0.) SIDTKemper, Bushnell, et al., 1993gas phase; «DELTA»rS(530 K); M

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

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

Quantity Value Units Method Reference Comment
Deltar22.9cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; switching reaction(Co+).2H2, «DELTA»rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
17.4 (+0.8,-0.) SIDTKemper, Bushnell, et al., 1993gas phase; switching reaction(Co+).2H2, «DELTA»rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

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

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

Quantity Value Units Method Reference Comment
Deltar21.8cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; switching reaction(Co+)2H2, «DELTA»rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
22.6 (+1.2,-0.) SIDTKemper, Bushnell, et al., 1993gas phase; switching reaction(Co+)2H2, «DELTA»rS(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
Deltar45.9 ± 3.6kcal/molPIMSMartinho Simões and Beauchamp, 1990The reaction enthalpy was derived from the appearance energy of Mn(CO)5(+), 224.8 ± 1.1 kcal/mol, using Mn(CO)5(Me) as the neutral precursor, together with the adiabatic ionization energy of Mn(CO)5 radical, 179. ± 3.3 kcal/mol Martinho Simões and Beauchamp, 1990; MS

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

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

Quantity Value Units Method Reference Comment
Deltar26.1cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; «DELTA»rS(500 K); M

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
22.9 (+1.2,-0.) CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID; M
24.8 (+1.0,-0.) SIDTKemper, Bushnell, et al., 1993gas phase; «DELTA»rS(500 K); M

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

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

Quantity Value Units Method Reference Comment
Deltar3.1 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Deltar4.1kcal/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Quantity Value Units Method Reference Comment
Deltar22.4cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Deltar26.1cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar3.0 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Deltar3.9kcal/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Quantity Value Units Method Reference Comment
Deltar23.7cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Deltar26.6cal/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
Deltar-65.61 ± 0.53kcal/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+) bullet Methane) + Ethane = (Cobalt ion (1+) bullet Ethane bullet Methane)

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

Quantity Value Units Method Reference Comment
Deltar25.9cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; switching reaction(Co+).2CH4, «DELTA»rS(480 K); M

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
28.4 (+1.3,-0.) SIDTKemper, Bushnell, et al., 1993gas phase; switching reaction(Co+).2CH4, «DELTA»rS(480 K); M

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

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

Quantity Value Units Method Reference Comment
Deltar37.0 ± 3.1kcal/molKinSMartin and Finke, 1990solvent: Ethylene glycol; Please also see Martin and Finke, 1992. The reaction enthalpy relies on 41.0 ± 3.0 kcal/mol for the reaction activation enthalpy. The reaction refers to "base-on" cobalamine.; MS

C3H7+ + Methane = (C3H7+ bullet Methane)

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

Quantity Value Units Method Reference Comment
Deltar2.59kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Deltar3.4kcal/molPHPMSHiraoka and Kebarle, 1976gas phase; M
Quantity Value Units Method Reference Comment
Deltar17.4cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M
Deltar20.cal/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
Deltar-12.56 ± 0.13kcal/molEqkGolden, Walsh, et al., 1965gas phase; ALS
Deltar-12.67 ± 0.05kcal/molEqkGoy and Pritchard, 1965gas phase; ALS
Deltar-11.0 ± 1.3kcal/molCmNichol and Ubbelohde, 1952gas phase; ALS

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

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

Quantity Value Units Method Reference Comment
Deltar1.91kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Deltar22.cal/mol*KN/AHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M

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

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

Quantity Value Units Method Reference Comment
Deltar1.98kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Deltar22.cal/mol*KN/AHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M

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

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

Quantity Value Units Method Reference Comment
Deltar1.86kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Deltar20.cal/mol*KN/AHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M

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

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

Quantity Value Units Method Reference Comment
Deltar1.54kcal/molPHPMSHiraoka and Mori, 1989gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Deltar20.cal/mol*KN/AHiraoka and Mori, 1989gas phase; Entropy change calculated or estimated; M

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

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

Quantity Value Units Method Reference Comment
Deltar27.0cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; «DELTA»rS(525 K); M

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
25.9 (+0.7,-0.) SIDTKemper, Bushnell, et al., 1993gas phase; «DELTA»rS(525 K); M

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

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

Quantity Value Units Method Reference Comment
Deltar3.4kcal/molHPMSBennet and Field, 1972gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Deltar8.1cal/mol*KHPMSBennet and Field, 1972gas phase; Entropy change is questionable; M

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

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

Quantity Value Units Method Reference Comment
Deltar26.4cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; «DELTA»rS(490 K); M

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
24.4 (+1.1,-0.) SIDTKemper, Bushnell, et al., 1993gas phase; «DELTA»rS(490 K); M

NH4+ + Methane = (NH4+ bullet Methane)

By formula: H4N+ + CH4 = (H4N+ bullet CH4)

Quantity Value Units Method Reference Comment
Deltar3.6kcal/molHPMSBennet and Field, 1972, 2gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Deltar15.5cal/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
Deltar-75.84 ± 0.48kcal/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
Deltar-39.05 ± 0.30kcal/molChydLacher, Amador, et al., 1967gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -40.07 ± 0.30 kcal/mol; At 250 C; ALS

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

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

Quantity Value Units Method Reference Comment
Deltar-81.7 ± 0.2kcal/molRSCCarson, Hartley, et al., 1949Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

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

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

Quantity Value Units Method Reference Comment
Deltar2.8 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Deltar24.8cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.7 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Deltar25.3cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.7 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Deltar26.5cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.0 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Deltar21.6cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.28kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar17.9cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.26kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar18.4cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.22kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar18.9cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.21kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar19.4cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.13kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar20.7cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.10kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar21.0cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.08kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar21.8cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.26kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar18.4cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.20kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar19.0cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.20kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar20.9cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.19kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar21.0cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.16kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar21.8cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.37kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar19.7cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.36kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar20.0cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.21kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar19.4cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.09kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar19.3cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar2.05kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar19.7cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

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

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

Quantity Value Units Method Reference Comment
Deltar1.99kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Deltar20.1cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas 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.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Manion, 2002
Manion, J.A., Evaluated Enthalpies of Formation of the Stable Closed Shell C1 and C2 Chlorinated Hydrocarbons, J. Phys. Chem. Ref. Data, 2002, 31, 1, 123-172, https://doi.org/10.1063/1.1420703 . [all data]

Gurvich, Veyts, et al., 1991
Thermodynamic Properties of Individual Substances, 4th edition, Volume 2, Gurvich, L.V.; Veyts, I.V.; Alcock, C.B.;, ed(s)., Hemisphere, New York, 1991. [all data]

Pittam and Pilcher, 1972
Pittam, D.A.; Pilcher, G., Measurements of heats of combustion by flame calorimetry. Part 8.-Methane, ethane, propane, n-butane and 2-methylpropane, J. Chem. Soc. Faraday Trans. 1, 1972, 68, 2224-2229. [all data]

Prosen and Rossini, 1945
Prosen, E.J.; Rossini, F.D., Heats of combustion and formation of the paraffin hydrocarbons at 25° C, J. Res. NBS, 1945, 263-267. [all data]

Roth and Banse, 1932
Roth, W.A.; Banse, H., Die verbrennungs- und bildungswarme von kohlenoxyd und methan, Arch. Eisenhutten., 1932, 6, 43-46. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Rossini, 1931
Rossini, F.D., The heats of combustion of methane and carbon monoxide, J. Res. NBS, 1931, 6, 37-49. [all data]

Colwell J.H., 1963
Colwell J.H., Thermodynamic properties of CH4 and CD4. Interpretation of the properties of solid, J. Chem. Phys., 1963, 39, 635-653. [all data]

Vogt G.J., 1976
Vogt G.J., Entropy and heat capacity of methane; spin-species conversion, J. Chem. Thermodyn., 1976, 8, 1011-1031. [all data]

Friend D.G., 1989
Friend D.G., Thermophysical properties of methane, J. Phys. Chem. Ref. Data, 1989, 18, 583-638. [all data]

Gurvich, Veyts, et al., 1989
Gurvich, L.V.; Veyts, I.V.; Alcock, C.B., Thermodynamic Properties of Individual Substances, 4th ed.; Vols. 1 and 2, Hemisphere, New York, 1989. [all data]

Giauque W.F., 1931
Giauque W.F., The entropies of methane and ammonia, Phys. Rev., 1931, 38, 196-197. [all data]

East A.L.L., 1997
East A.L.L., Ab initio statistical thermodynamical models for the computation of third-law entropies, J. Chem. Phys., 1997, 106, 6655-6674. [all data]

Halford J.O., 1957
Halford J.O., Standard heat capacities of gaseous methanol, ethanol, methane and ethane at 279 K by thermal conductivity, J. Phys. Chem., 1957, 61, 1536-1539. [all data]

McDowell R.S., 1963
McDowell R.S., Thermodynamic functions of methane, J. Chem. Eng. Data, 1963, 8, 547-548. [all data]

Ellison, Engelking, et al., 1978
Ellison, G.B.; Engelking, P.C.; Lineberger, W.C., An experimental determination of the geometry and electron affinity of CH3, J. Am. Chem. Soc., 1978, 100, 2556. [all data]

Graul and Squires, 1990
Graul, S.T.; Squires, R.R., Gas-Phase Acidities Derived from Threshold Energies for Activated Reactions, J. Am. Chem. Soc., 1990, 112, 7, 2517, https://doi.org/10.1021/ja00163a007 . [all data]

Bohme, Lee-Ruff, et al., 1972
Bohme, D.K.; Lee-Ruff, E.; Young, L.B., Acidity order of selected bronsted acids in the gas phase at 300K, J. Am. Chem. Soc., 1972, 94, 5153. [all data]

Check, Faust, et al., 2001
Check, C.E.; Faust, T.O.; Bailey, J.M.; Wright, B.J.; Gilbert, T.M.; Sunderlin, L.S., Addition of Polarization and Diffuse Functions to the LANL2DZ Basis Set for P-Block Elements, J. Phys. Chem. A,, 2001, 105, 34, 8111, https://doi.org/10.1021/jp011945l . [all data]

Hiraoka and Mori, 1989
Hiraoka, K.; Mori, T., Gas - Phase Stability and Structure of Cluster Ions CH5+(CH4)n with n = 1 - 9, Chem. Phys. Lett., 1989, 161, 2, 111, https://doi.org/10.1016/0009-2614(89)85040-7 . [all data]

Hiraoka and Kebarle, 1975
Hiraoka, K.; Kebarle, P., Energetics, Stabilities and Possible Structures of CH5+(CH4)n Clusters from Gas Phase Study of Equilibria CH5+(CH4)n - 1 + CH4 = CH5+(CH4)n for n = 1 - 5, J. Am. Chem. Soc., 1975, 97, 15, 4179, https://doi.org/10.1021/ja00848a005 . [all data]

Field and Beggs, 1971
Field, F.H.; Beggs, D.P., Reversible Reactions of Gas Phase Ions. III. Studies with Methane at 0.1-1.0 Torr and 77-300 K, J. Am. Chem. Soc., 1971, 93, 7, 1585, https://doi.org/10.1021/ja00736a003 . [all data]

Hiraoka, Mori, et al., 1993
Hiraoka, K.; Mori, T.; Yamabe, S., The Gas-Phase Solvation of C2H5+, s-C3H7+ and s-C4H9+ with CH4. The Isomeric Structures of C2H5+ and C2H5+.CH4, Chem. Phys. Lett., 1993, 207, 2-3, 178, https://doi.org/10.1016/0009-2614(93)87011-Q . [all data]

Hiroka and Kebarle, 1975
Hiroka, K.; Kebarle, P., Information on the Proton Affinity and Protolysis of Propane from Measurement of the Ion Cluster Equilibrium: C2H5+ + CH4 = C3H9+, Can. J. Phys., 1975, 53, 970. [all data]

Kemper, Bushnell, et al., 1993
Kemper, P.R.; Bushnell, J.; Von Koppen, P.; Bowers, M.T., Binding Energies of Co+(H2/CH4/C2H6)1,2,3 Clusters, J. Phys. Chem., 1993, 97, 9, 1810, https://doi.org/10.1021/j100111a016 . [all data]

Armentrout and Kickel, 1994
Armentrout, P.B.; Kickel, B.L., Gas Phase Thermochemistry of Transition Metal Ligand Systems: Reassessment of Values and Periodic Trends, in Organometallic Ion Chemistry, B. S. Freiser, ed, 1994. [all data]

Haynes and Armentrout, 1996
Haynes, C.L.; Armentrout, P.B., Guided Ion Beam Determination of the Co+ - H2 Bond Dissociation energy, Chem Phys. Let., 1996, 249, 1-2, 64, https://doi.org/10.1016/0009-2614(95)01337-7 . [all data]

Kemper, Bushnell, et al., 1993, 2
Kemper, P.R.; Bushnell, J.; Von Helden, G.; Bowers, M.T., Co+(H2)n Clusters: Binding Energies and Molecular Parameters, J. Chem Phys., 1993, 97, 1, 52, https://doi.org/10.1021/j100103a012 . [all data]

Martinho Simões and Beauchamp, 1990
Martinho Simões, J.A.; Beauchamp, J.L., Chem. Rev., 1990, 90, 629. [all data]

Holm, 1981
Holm, T., J. Chem. Soc., Perkin Trans. II, 1981, 464.. [all data]

Pedley, 1994
Pedley, J.B., Thermodynamic Data and Structures of Organic Compounds; Thermodynamics Research Center Data Series, Vol I, Thermodynamics Research Center, College Station, 1994. [all data]

Martin and Finke, 1990
Martin, B.D.; Finke, R.G., J. Am. Chem. Soc., 1990, 112, 2419. [all data]

Martin and Finke, 1992
Martin, B.D.; Finke, R.G., J. Am. Chem. Soc., 1992, 114, 585. [all data]

Hiraoka and Kebarle, 1976
Hiraoka, K.; Kebarle, P., Stabilities and Energetics of Pentacoordinated Carbonium Ions. The Isomeric C2H7+ Ions and Some Higher Analogues: C3H9+ and C4H11+, J. Am. Chem. Soc., 1976, 98, 20, 6119, https://doi.org/10.1021/ja00436a009 . [all data]

Golden, Walsh, et al., 1965
Golden, D.M.; Walsh, R.; Benson, S.W., The thermochemistry of the gas phase equilibrium I2 + CH4 «=» CH3I + HI and the heat of formation of the methyl radical, J. Am. Chem. Soc., 1965, 87, 4053-4057. [all data]

Goy and Pritchard, 1965
Goy, C.A.; Pritchard, H.O., Kinetics and thermodynamics of the reaction between iodine and methane and the heat of formation of methyl iodide, J. Phys. Chem., 1965, 69, 3040-3041. [all data]

Nichol and Ubbelohde, 1952
Nichol, R.J.; Ubbelohde, A.R., A thermochemical evaluation of bond strengths in some carbon compounds. part II. Bond strengths based on the reaction CH3I + HI = CH4 + I2, J. Am. Chem. Soc., 1952, 415-421. [all data]

Bennet and Field, 1972
Bennet, S.L.; Field, F.H., Reversible Reactions of Gaseous Ions. V. The Methane - Water System at Low Temperatures, J. Am. Chem. Soc., 1972, 94, 15, 5188, https://doi.org/10.1021/ja00770a008 . [all data]

Bennet and Field, 1972, 2
Bennet, S.L.; Field, F.H., Reversible Reactions of Gaseous Ions. VI. The NH3 - CH4, H2S - CH4 and CF4 - CH4 Systems at Low Temperatures, J. Am. Chem. Soc., 1972, 94, 18, 6305, https://doi.org/10.1021/ja00773a009 . [all data]

Holm, 1974
Holm, T., J. Organometal. Chem., 1974, 77, 27. [all data]

Pedley and Rylance, 1977
Pedley, J.B.; Rylance, J., Computer Analysed Thermochemical Data: Organic and Organometallic Compounds, University of Sussex, Brigton, 1977. [all data]

Liebman, Martinho Simões, et al., 1995
Liebman, J.F.; Martinho Simões, J.A.; Slayden, S.W., In Lithium Chemistry: A Theoretical and Experimental Overview Wiley: New York, Sapse, A.-M.; Schleyer, P. von Ragué, ed(s)., 1995. [all data]

Lacher, Amador, et al., 1967
Lacher, J.R.; Amador, A.; Park, J.D., Reaction heats of organic compounds. Part 5.-Heats of hydrogenation of dichloromethane, 1,1- and 1,2-dichloroethane and 1,2-dichloropropane, Trans. Faraday Soc., 1967, 63, 1608-1611. [all data]

Carson, Hartley, et al., 1949
Carson, A.S.; Hartley, K.; Skinner, H.A., Thermochemistry of metal alkyls. Part II.?The bond dissociation energies of some Zn?C and Cd?C bonds, and of Et?I., Trans. Faraday Soc., 1949, 45, 1159, https://doi.org/10.1039/tf9494501159 . [all data]

Cox and Pilcher, 1970, 2
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds in Academic Press, New York, 1970. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, References