Selected ATcT [1, 2] enthalpy of formation based on version 1.122p of the Thermochemical Network [3] This version of ATcT results was generated from an expansion of version 1.122o [4] to include an updated enthalpy of formation for Hydrazine. [5].
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| Species Name |
Formula |
Image |
ΔfH°(0 K) |
ΔfH°(298.15 K) |
Uncertainty |
Units |
Relative
Molecular
Mass |
ATcT ID |
| Methanium | [CH5]+ (g) | ![[CH5+]](../images/164.png) | 921.92 | 911.67 | ± 0.45 | kJ/mol | 17.04985 ±
0.00087 | 15135-49-6*0 |
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Representative Geometry of [CH5]+ (g) |
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| spin ON spin OFF |
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Top contributors to the provenance of ΔfH° of [CH5]+ (g)The 20 contributors listed below account only for 60.0% of the provenance of ΔfH° of [CH5]+ (g).
A total of 79 contributors would be needed to account for 90% of the provenance.
Please note: The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The Reference acts as a further link to the relevant references and notes for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.
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Contribution
(%) | TN
ID | Reaction | Measured Quantity | Reference | | 13.5 | 3634.14 | HC(O)OH (g, syn) → [HOCO]+ (g) + H (g) | ΔrH°(0 K) = 1187.3 ± 1.0 kJ/mol | Shuman 2010a | | 8.5 | 3634.2 | HC(O)OH (g, syn) → [HOCO]+ (g) + H (g) | ΔrH°(0 K) = 12.316 ± 0.013 eV | Ruscic 1989 | | 6.5 | 1897.2 | [CH5]+ (g) + CO (g) → [HCO]+ (g) + CH4 (g) | ΔrH°(441 K) = -11.5 ± 0.4 kcal/mol | Szulejko 1993, 2nd Law, note unc5 | | 4.1 | 1897.1 | [CH5]+ (g) + CO (g) → [HCO]+ (g) + CH4 (g) | ΔrG°(441 K) = -8.6 ± 0.5 kcal/mol | Szulejko 1993, 3rd Law, note unc5 | | 3.6 | 3634.4 | HC(O)OH (g, syn) → [HOCO]+ (g) + H (g) | ΔrH°(0 K) = 12.30 ± 0.02 eV | Shuman 2010a, est unc | | 3.6 | 3634.6 | HC(O)OH (g, syn) → [HOCO]+ (g) + H (g) | ΔrH°(0 K) = 12.31 ± 0.02 eV | Villem 1975, Akopyan 1976, AE corr | | 3.6 | 3634.1 | HC(O)OH (g, syn) → [HOCO]+ (g) + H (g) | ΔrH°(0 K) = 12.30 ± 0.02 eV | Ruscic 1989 | | 1.6 | 1898.8 | [CH5]+ (g) + H2O (g) → [H3O]+ (g) + CH4 (g) | ΔrH°(0 K) = -34.21 ± 0.8 kcal/mol | Ruscic W1RO | | 1.6 | 3634.5 | HC(O)OH (g, syn) → [HOCO]+ (g) + H (g) | ΔrH°(0 K) = 12.29 ± 0.03 eV | Warneck 1974 | | 1.5 | 1990.2 | [C2H7]+ (g) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) | ΔrG°(334 K) = 10.5 ± 0.7 kcal/mol | Szulejko 1993, 3rd Law, note unc5 | | 1.3 | 1890.8 | [CH5]+ (g) → CH4 (g) + H+ (g) | ΔrH°(0 K) = 129.28 ± 0.90 kcal/mol | Ruscic W1RO | | 1.2 | 3635.8 | [HOCO]+ (g) → CO2 (g) + H+ (g) | ΔrH°(0 K) = 128.00 ± 0.90 kcal/mol | Ruscic W1RO | | 1.2 | 1535.3 | [NNH]+ (g) + CO2 (g) → N2 (g) + [HOCO]+ (g) | ΔrG°(561 K) = -12.6 ± 0.6 (×1.242) kcal/mol | Szulejko 1993, 3rd Law, note unc5 | | 1.1 | 1984.5 | [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) | ΔrH°(0 K) = 10.71 ± 0.8 kcal/mol | Ruscic W1RO | | 1.1 | 1888.1 | 2 H2 (g) + C (graphite) → CH4 (g) | ΔrG°(1165 K) = 37.521 ± 0.068 kJ/mol | Smith 1946, note COf, 3rd Law | | 1.0 | 1891.4 | [CH5]+ (g) → [CH3]+ (g) + H2 (g) | ΔrH°(0 K) = 42.0 ± 1 kcal/mol | Muller 1997 | | 1.0 | 1890.13 | [CH5]+ (g) → CH4 (g) + H+ (g) | ΔrH°(0 K) = 128.5 ± 1.0 kcal/mol | Komornicki 1992, note unc2 | | 1.0 | 1890.12 | [CH5]+ (g) → CH4 (g) + H+ (g) | ΔrH°(0 K) = 129.4 ± 1 kcal/mol | Muller 1997 | | 1.0 | 3570.2 | HC(O)OH (cr,l) + 1/2 O2 (g) → CO2 (g) + H2O (cr,l) | ΔrH°(298.15 K) = -60.807 ± 0.074 kcal/mol | Lebedeva 1964 | | 1.0 | 1898.4 | [CH5]+ (g) + H2O (g) → [H3O]+ (g) + CH4 (g) | ΔrH°(0 K) = -34.79 ± 1.0 kcal/mol | Ruscic G4 |
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Top 10 species with enthalpies of formation correlated to the ΔfH° of [CH5]+ (g) |
Please note: The correlation coefficients are obtained by renormalizing the off-diagonal elements of the covariance matrix by the corresponding variances.
The correlation coefficient is a number from -1 to 1, with 1 representing perfectly correlated species, -1 representing perfectly anti-correlated species, and 0 representing perfectly uncorrelated species.
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Correlation
Coefficent
(%) | Species Name | Formula | Image | ΔfH°(0 K) | ΔfH°(298.15 K) | Uncertainty | Units | Relative
Molecular
Mass | ATcT ID | | 96.6 | Hydroxyoxomethylium | [HOCO]+ (g) | ![O[C+]=O](../images/206.png) | 600.63 | 597.54 | ± 0.44 | kJ/mol | 45.0169 ±
0.0010 | 638-71-1*0 | | 24.7 | Formic acid | HC(O)OH (g, syn) |  | -371.11 | -378.42 | ± 0.22 | kJ/mol | 46.0254 ±
0.0010 | 64-18-6*1 | | 24.7 | Formic acid | HC(O)OH (g) |  | -371.11 | -378.40 | ± 0.22 | kJ/mol | 46.0254 ±
0.0010 | 64-18-6*0 | | 21.0 | Formic acid cation | [HC(O)OH]+ (g, syn) | O](../images/535.png) | 721.87 | 714.78 | ± 0.26 | kJ/mol | 46.0248 ±
0.0010 | 50614-05-6*1 | | 21.0 | Formic acid cation | [HC(O)OH]+ (g) | O](../images/1514.png) | 721.87 | 715.34 | ± 0.26 | kJ/mol | 46.0248 ±
0.0010 | 50614-05-6*0 | | 16.9 | Formic acid | HC(O)OH (cr,l) |  | -431.55 | -424.72 | ± 0.20 | kJ/mol | 46.0254 ±
0.0010 | 64-18-6*500 | | 13.3 | Methane | CH4 (g) |  | -66.561 | -74.530 | ± 0.055 | kJ/mol | 16.04246 ±
0.00085 | 74-82-8*0 | | 13.2 | Formic acid | HC(O)OH (g, anti) |  | -354.76 | -361.86 | ± 0.38 | kJ/mol | 46.0254 ±
0.0010 | 64-18-6*2 | | 13.0 | Methylium | [CH3]+ (g) | ![[CH3+]](../images/105.png) | 1099.336 | 1095.392 | ± 0.056 | kJ/mol | 15.03397 ±
0.00083 | 14531-53-4*0 | | 12.3 | Ethanium | [C2H7]+ (g, bridged C2) | ![[CH3+][H][CH3]](../images/257.png) | 874.33 | 858.06 | ± 0.62 | kJ/mol | 31.0764 ±
0.0017 | 24669-33-8*1 |
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Most Influential reactions involving [CH5]+ (g)Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.
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Influence
Coefficient | TN
ID | Reaction | Measured Quantity | Reference | | 0.252 | 1895.5 | [CH5]+ (g) + CO2 (g) → [HOCO]+ (g) + CH4 (g) | ΔrG°(296 K) = 7.92 ± 0.20 kJ/mol | Bohme 1973a, 3rd Law, note unc | | 0.229 | 1895.7 | [CH5]+ (g) + CO2 (g) → [HOCO]+ (g) + CH4 (g) | ΔrG°(296 K) = 7.82 ± 0.21 kJ/mol | Hemsworth 1973, 3rd Law, note unc | | 0.208 | 1895.6 | [CH5]+ (g) + CO2 (g) → [HOCO]+ (g) + CH4 (g) | ΔrG°(296 K) = 7.72 ± 0.22 kJ/mol | Bohme 1973a, 3rd Law, note unc | | 0.161 | 1895.4 | [CH5]+ (g) + CO2 (g) → [HOCO]+ (g) + CH4 (g) | ΔrG°(296 K) = 7.78 ± 0.25 kJ/mol | Bohme 1973a, 3rd Law, note unc | | 0.087 | 1895.3 | [CH5]+ (g) + CO2 (g) → [HOCO]+ (g) + CH4 (g) | ΔrG°(296 K) = 7.86 ± 0.34 kJ/mol | Bohme 1973a, 3rd Law, note unc | | 0.070 | 1897.2 | [CH5]+ (g) + CO (g) → [HCO]+ (g) + CH4 (g) | ΔrH°(441 K) = -11.5 ± 0.4 kcal/mol | Szulejko 1993, 2nd Law, note unc5 | | 0.057 | 1990.2 | [C2H7]+ (g) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) | ΔrG°(334 K) = 10.5 ± 0.7 kcal/mol | Szulejko 1993, 3rd Law, note unc5 | | 0.044 | 1897.1 | [CH5]+ (g) + CO (g) → [HCO]+ (g) + CH4 (g) | ΔrG°(441 K) = -8.6 ± 0.5 kcal/mol | Szulejko 1993, 3rd Law, note unc5 | | 0.044 | 1984.5 | [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) | ΔrH°(0 K) = 10.71 ± 0.8 kcal/mol | Ruscic W1RO | | 0.033 | 1538.1 | [NNH]+ (g) + CH4 (g) → [CH5]+ (g) + N2 (g) | ΔrH°(0 K) = -12.2 ± 1.0 kcal/mol | Komornicki 1992, est unc | | 0.028 | 1984.2 | [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) | ΔrH°(0 K) = 11.24 ± 1.0 kcal/mol | Ruscic G4 | | 0.028 | 1984.4 | [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) | ΔrH°(0 K) = 11.75 ± 1.0 kcal/mol | Ruscic CBS-n | | 0.026 | 1895.11 | [CH5]+ (g) + CO2 (g) → [HOCO]+ (g) + CH4 (g) | ΔrG°(296 K) = 1.869 ± 0.149 kcal/mol | Bohme 1980, 3rd Law, note unc | | 0.019 | 1984.1 | [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) | ΔrH°(0 K) = 11.58 ± 1.2 kcal/mol | Ruscic G3X | | 0.019 | 1898.8 | [CH5]+ (g) + H2O (g) → [H3O]+ (g) + CH4 (g) | ΔrH°(0 K) = -34.21 ± 0.8 kcal/mol | Ruscic W1RO | | 0.016 | 1984.3 | [C2H7]+ (g, bridged C2) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) | ΔrH°(0 K) = 11.55 ± 1.3 kcal/mol | Ruscic CBS-n | | 0.015 | 1990.1 | [C2H7]+ (g) + CH4 (g) → [CH5]+ (g) + CH3CH3 (g) | ΔrH°(334 K) = 11.9 ± 0.7 (×1.957) kcal/mol | Szulejko 1993, 2nd Law, note unc5 | | 0.013 | 1890.8 | [CH5]+ (g) → CH4 (g) + H+ (g) | ΔrH°(0 K) = 129.28 ± 0.90 kcal/mol | Ruscic W1RO | | 0.012 | 1898.7 | [CH5]+ (g) + H2O (g) → [H3O]+ (g) + CH4 (g) | ΔrH°(0 K) = -35.17 ± 1.0 kcal/mol | Ruscic CBS-n | | 0.012 | 1898.4 | [CH5]+ (g) + H2O (g) → [H3O]+ (g) + CH4 (g) | ΔrH°(0 K) = -34.79 ± 1.0 kcal/mol | Ruscic G4 |
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References
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1
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B. Ruscic, R. E. Pinzon, M. L. Morton, G. von Laszewski, S. Bittner, S. G. Nijsure, K. A. Amin, M. Minkoff, and A. F. Wagner,
Introduction to Active Thermochemical Tables: Several "Key" Enthalpies of Formation Revisited.
J. Phys. Chem. A 108, 9979-9997 (2004)
[DOI: 10.1021/jp047912y]
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2
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B. Ruscic, R. E. Pinzon, G. von Laszewski, D. Kodeboyina, A. Burcat, D. Leahy, D. Montoya, and A. F. Wagner,
Active Thermochemical Tables: Thermochemistry for the 21st Century.
J. Phys. Conf. Ser. 16, 561-570 (2005)
[DOI: 10.1088/1742-6596/16/1/078]
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3
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B. Ruscic and D. H. Bross,
Active Thermochemical Tables (ATcT) values based on ver. 1.122p of the Thermochemical Network (2020); available at ATcT.anl.gov |
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4
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P. B. Changala, T. L. Nguyen, J. H. Baraban, G. B. Ellison, J. F. Stanton, D. H. Bross, and B. Ruscic,
Active Thermochemical Tables: The Adiabatic Ionization Energy of Hydrogen Peroxide.
J. Phys. Chem. A 121, 8799-8806 (2017)
[DOI: 10.1021/acs.jpca.7b06221] (highlighted on the journal cover)
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5
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D. Feller, D. H. Bross, and B. Ruscic,
Enthalpy of Formation of N2H4 (Hydrazine) Revisited.
J. Phys. Chem. A 121, 6187-6198 (2017)
[DOI: 10.1021/acs.jpca.7b06017]
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6
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B. Ruscic,
Uncertainty Quantification in Thermochemistry, Benchmarking Electronic Structure Computations, and Active Thermochemical Tables.
Int. J. Quantum Chem. 114, 1097-1101 (2014)
[DOI: 10.1002/qua.24605]
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Formula
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The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.
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Uncertainties
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The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [6]).
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.0005 kJ/mol.
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Website Functionality Credits
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The reorganization of the website was developed and implemented by David H. Bross (ANL).
The find function is based on the complete Species Dictionary entries for the appropriate version of the ATcT TN.
The molecule images are rendered by Indigo-depict.
The XYZ renderings are based on Jmol: an open-source Java viewer for chemical structures in 3D. http://www.jmol.org/.
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Acknowledgement
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This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences under Contract No. DE-AC02-06CH11357.
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