Methane

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Phase change 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:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
DH - Eugene S. Domalski and Elizabeth D. Hearing
AC - William E. Acree, Jr., James S. Chickos

Quantity Value Units Method Reference Comment
Tboil111. ± 2.KAVGN/AAverage of 13 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus85.7KN/AStreng, 1971Uncertainty assigned by TRC = 0.2 K; TRC
Tfus90.6KN/AVan't Zelfde, Omar, et al., 1968Uncertainty assigned by TRC = 0.3 K; TRC
Tfus91.2KN/ATimmermans, 1935Uncertainty assigned by TRC = 2. K; TRC
Tfus90.6KN/AClusius, 1929Uncertainty assigned by TRC = 0.2 K; TRC
Tfus90.5KN/AEucken and Karwat, 1924Uncertainty assigned by TRC = 0.2 K; TRC
Quantity Value Units Method Reference Comment
Ttriple90.67 ± 0.03KAVGN/AAverage of 25 out of 32 values; Individual data points
Quantity Value Units Method Reference Comment
Ptriple0.1154 ± 0.0006atmAVGN/AAverage of 20 out of 23 values; Individual data points
Quantity Value Units Method Reference Comment
Tc190.6 ± 0.3KAVGN/AAverage of 19 out of 23 values; Individual data points
Quantity Value Units Method Reference Comment
Pc45.5 ± 0.3atmAVGN/AAverage of 16 out of 21 values; Individual data points
Quantity Value Units Method Reference Comment
Vc0.09860l/molN/AAmbrose and Tsonopoulos, 1995 
Vc0.09852l/molN/AYounglove and Ely, 1987TRC
Vc0.100l/molN/ATerry, Lynch, et al., 1969Uncertainty assigned by TRC = 0.001 l/mol; TRC
Quantity Value Units Method Reference Comment
ρc10.1 ± 0.2mol/lAVGN/AAverage of 16 out of 17 values; Individual data points

Enthalpy of vaporization

ΔvapH (kcal/mol) Temperature (K) Method Reference Comment
2.03699.54N/AVogt and Pitzer, 1976P = 2.81 kPa Data from Frank and Clusius, 1937 and 39FRA/CLU.; DH
2.1101.N/AStock, Henning, et al., 2006Based on data from 92. to 110. K. See also Boublik, Fried, et al., 1984.; AC
2.1105.AStephenson and Malanowski, 1987Based on data from 90. to 120. K.; AC
2.0134.AStephenson and Malanowski, 1987Based on data from 115. to 149. K.; AC
2.1174.AStephenson and Malanowski, 1987Based on data from 148. to 189. K.; AC
1.95111.7N/AMajer and Svoboda, 1985 
2.1112.N/AOtt, Goates, et al., 1972Based on data from 91. to 127. K. See also Boublik, Fried, et al., 1984.; AC
2.0175.N/AOtt, Goates, et al., 1972Based on data from 91. to 190. K.; AC
1.9137.N/AReid, 1972AC
2.1175.N/AAmbrose, Counsell, et al., 1970Based on data from 100. to 190. K.; AC
2.0112.CHestermans and White, 1961AC
1.8130.CHestermans and White, 1961AC
1.4160.CHestermans and White, 1961AC
0.96180.CHestermans and White, 1961AC
2.0149.N/AHestermans and White, 1961Based on data from 109. to 189. K.; AC
2.0 ± 0.0299.N/AFrank and Clusius, 1939AC

Enthalpy of vaporization

ΔvapH = A exp(-αTr) (1 − Tr)β
    ΔvapH = Enthalpy of vaporization (at saturation pressure) (kcal/mol)
    Tr = reduced temperature (T / Tc)

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Temperature (K) 112. to 180.
A (kcal/mol) 2.416
α -0.22
β 0.388
Tc (K) 190.6
ReferenceMajer and Svoboda, 1985

Entropy of vaporization

ΔvapS (cal/mol*K) Temperature (K) Reference Comment
20.4599.54Vogt and Pitzer, 1976P; DH

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (atm)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
90.99 to 189.993.9838443.028-0.49Prydz and Goodwin, 1972Coefficents calculated by NIST from author's data.
96.89 to 110.191.99682125.819-48.823Regnier, 1972Coefficents calculated by NIST from author's data.
93.04 to 107.843.79664403.106-5.479Cutler and Morrison, 1965Coefficents calculated by NIST from author's data.
110.00 to 190.54.21490516.68911.223Hestermans and White, 1961Coefficents calculated by NIST from author's data.

Enthalpy of sublimation

ΔsubH (kcal/mol) Temperature (K) Method Reference Comment
2.372.N/AStephenson and Malanowski, 1987Based on data from 53. to 91. K.; AC
2.272.N/ABondi, 1963Based on data from 54. to 90. K. See also Armstrong, Brickwedde, et al., 1955.; AC
2.3984.N/AJones, 1960Based on data from 79. to 89. K.; AC
2.363.A,MSTickner and Lossing, 1951Based on data from 48. to 78. K.; AC
2.3077.AStull, 1947Based on data from 67. to 88. K.; AC

Enthalpy of phase transition

ΔHtrs (kcal/mol) Temperature (K) Initial Phase Final Phase Reference Comment
0.0223620.53crystaline, IIcrystaline, IVogt and Pitzer, 1976Lambda transition.; DH
0.224590.67crystaline, IliquidVogt and Pitzer, 1976DH

Entropy of phase transition

ΔStrs (cal/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
1.08920.53crystaline, IIcrystaline, IVogt and Pitzer, 1976Lambda; DH
2.47690.67crystaline, IliquidVogt and Pitzer, 1976DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


Reaction thermochemistry data

Go To: Top, Phase change 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
Δr416.74 ± 0.70kcal/molD-EAEllison, Engelking, et al., 1978gas phase; B
Δr418.0 ± 3.5kcal/molCIDTGraul and Squires, 1990gas phase; B
Δr>404.18 ± 0.10kcal/molG+TSBohme, Lee-Ruff, et al., 1972gas phase; B
Δr414.80kcal/molN/ACheck, Faust, et al., 2001gas phase; FeBr3; ; ΔS(EA)=9.3; B
Quantity Value Units Method Reference Comment
Δr408.66 ± 0.80kcal/molH-TSEllison, Engelking, et al., 1978gas phase; B
Δr409.9 ± 3.6kcal/molH-TSGraul and Squires, 1990gas phase; B
Δr>396.10kcal/molIMRBBohme, Lee-Ruff, et al., 1972gas phase; B
Δr407.30kcal/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
Δr5.3 ± 0.3kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Δr5.9kcal/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Δr1.5kcal/molHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Δr24.9cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Δr24.4cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M
Δr7.2cal/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
Δr6.9 ± 0.3kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Δr7.4kcal/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Δr4.1kcal/molHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Δr22.1cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Δr20.8cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M
Δr12.4cal/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
Δr5.50kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Δr6.6kcal/molPHPMSHiroka and Kebarle, 1975gas phase; M
Δr2.4kcal/molHPMSField and Beggs, 1971gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Δr22.2cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M
Δr23.4cal/mol*KPHPMSHiroka and Kebarle, 1975gas phase; M
Δr8.6cal/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
Δr11.kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr20.cal/mol*KN/AKemper, Bushnell, et al., 1993gas phase; Entropy change calculated or estimated; M

Enthalpy of reaction

ΔrH° (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

ΔrG° (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+) • Methane)

By formula: Co+ + CH4 = (Co+ • CH4)

Quantity Value Units Method Reference Comment
Δr19.8cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrS(530 K); M

Enthalpy of reaction

ΔrH° (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; 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
Δr22.9cal/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° (kcal/mol) T (K) Method Reference Comment
17.4 (+0.8,-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
Δr21.8cal/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° (kcal/mol) T (K) Method Reference Comment
22.6 (+1.2,-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
Δr45.9 ± 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+) • Methane) + Methane = (Cobalt ion (1+) • 2Methane)

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

Quantity Value Units Method Reference Comment
Δr26.1cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrS(500 K); M

Enthalpy of reaction

ΔrH° (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; ΔrS(500 K); M

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

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

Quantity Value Units Method Reference Comment
Δr3.1 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Δr4.1kcal/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Quantity Value Units Method Reference Comment
Δr22.4cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Δr26.1cal/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
Δr3.0 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Δr3.9kcal/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Quantity Value Units Method Reference Comment
Δr23.7cal/mol*KPHPMSHiraoka and Mori, 1989gas phase; M
Δr26.6cal/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
Δr-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+) • Methane) + Ethane = (Cobalt ion (1+) • Ethane • Methane)

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

Quantity Value Units Method Reference Comment
Δr25.9cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; switching reaction(Co+).2CH4, ΔrS(480 K); M

Enthalpy of reaction

ΔrH° (kcal/mol) T (K) Method Reference Comment
28.4 (+1.3,-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
Δr37.0 ± 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+ • Methane)

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

Quantity Value Units Method Reference Comment
Δr2.59kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Δr3.4kcal/molPHPMSHiraoka and Kebarle, 1976gas phase; M
Quantity Value Units Method Reference Comment
Δr17.4cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M
Δr20.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
Δr-12.56 ± 0.13kcal/molEqkGolden, Walsh, et al., 1965gas phase; ALS
Δr-12.67 ± 0.05kcal/molEqkGoy and Pritchard, 1965gas phase; ALS
Δr-11.0 ± 1.3kcal/molCmNichol and Ubbelohde, 1952gas phase; ALS

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

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

Quantity Value Units Method Reference Comment
Δr1.91kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr22.cal/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
Δr1.98kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr22.cal/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
Δr1.86kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr20.cal/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
Δr1.54kcal/molPHPMSHiraoka and Mori, 1989gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr20.cal/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
Δr27.0cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrS(525 K); M

Enthalpy of reaction

ΔrH° (kcal/mol) T (K) Method Reference Comment
25.9 (+0.7,-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
Δr3.4kcal/molHPMSBennet and Field, 1972gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Δr8.1cal/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
Δr26.4cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrS(490 K); M

Enthalpy of reaction

ΔrH° (kcal/mol) T (K) Method Reference Comment
24.4 (+1.1,-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
Δr3.6kcal/molHPMSBennet and Field, 1972, 2gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Δr15.5cal/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
Δr-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
Δr-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 • 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-81.7 ± 0.2kcal/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
Δr2.8 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Δr24.8cal/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
Δr2.7 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Δr25.3cal/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
Δr2.7 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Δr26.5cal/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
Δr2.0 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase; M
Quantity Value Units Method Reference Comment
Δr21.6cal/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
Δr2.28kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr17.9cal/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
Δr2.26kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr18.4cal/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
Δr2.22kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr18.9cal/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
Δr2.21kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr19.4cal/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
Δr2.13kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr20.7cal/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
Δr2.10kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr21.0cal/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
Δr2.08kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr21.8cal/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
Δr2.26kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr18.4cal/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
Δr2.20kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr19.0cal/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
Δr2.20kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr20.9cal/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
Δr2.19kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr21.0cal/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
Δr2.16kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr21.8cal/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
Δr2.37kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr19.7cal/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
Δr2.36kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr20.0cal/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
Δr2.21kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr19.4cal/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
Δr2.09kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr19.3cal/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
Δr2.05kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr19.7cal/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
Δr1.99kcal/molPHPMSHiraoka, Mori, et al., 1993gas phase; M
Quantity Value Units Method Reference Comment
Δr20.1cal/mol*KPHPMSHiraoka, Mori, et al., 1993gas phase; M

References

Go To: Top, Phase change 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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Vogt, G.J.; Pitzer, K.S., Entropy and heat capacity of methane, spin-species conversion, J. Chem. Thermodynam., 1976, 8, 1011-1031. [all data]

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Prydz and Goodwin, 1972
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Jones, 1960
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Tickner and Lossing, 1951
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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]

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


Notes

Go To: Top, Phase change data, Reaction thermochemistry data, References