Selected ATcT [1, 2] enthalpy of formation based on version 1.122 of the Thermochemical Network [3]
This version of ATcT results was partially described in Ruscic et al. [4],
and was also used for the initial development of high-accuracy ANLn composite electronic structure methods [5].
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| Species Name |
Formula |
Image |
ΔfH°(0 K) |
ΔfH°(298.15 K) |
Uncertainty |
Units |
Relative
Molecular
Mass |
ATcT ID |
| Ethyl | CH3CH2 (g) | ![C[CH2]](../images/42.png) | 130.92 | 119.86 | ± 0.28 | kJ/mol | 29.0611 ±
0.0016 | 2025-56-1*0 |
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Representative Geometry of CH3CH2 (g) |
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| spin ON spin OFF |
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Top contributors to the provenance of ΔfH° of CH3CH2 (g)The 20 contributors listed below account only for 32.9% of the provenance of ΔfH° of CH3CH2 (g).
A total of 374 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 | | 4.0 | 1741.1 | CH3CH2 (g) → [CH3CH2]+ (g) | ΔrH°(0 K) = 8.117 ± 0.008 (×1.215) eV | Ruscic 1989b | | 3.8 | 1741.14 | CH3CH2 (g) → [CH3CH2]+ (g) | ΔrH°(0 K) = 8.124 ± 0.010 eV | Lau 2005 | | 2.6 | 1754.8 | CH3CH2 (g) + HBr (g) → C2H6 (g) + Br (g) | ΔrG°(530 K) = -8.58 ± 0.30 kcal/mol | Dobis 1997, Seakins 1992, Nicovich 1991, King 1970a, 3rd Law | | 2.1 | 1722.1 | C2H6 (g) + 7/2 O2 (g) → 2 CO2 (g) + 3 H2O (cr,l) | ΔrH°(298.15 K) = -1560.68 ± 0.25 kJ/mol | Pittam 1972 | | 1.8 | 1752.1 | CH3CH2 (g) + HBr (g) → C2H6 (g) + Br (g) | ΔrG°(450 K) = -38.3 ± 1.5 kJ/mol | Ferrell 1998, 3rd Law, est unc | | 1.8 | 1752.2 | CH3CH2 (g) + HBr (g) → C2H6 (g) + Br (g) | ΔrH°(450 K) = -57.5 ± 1.5 kJ/mol | Ferrell 1998, 2nd Law, est unc | | 1.5 | 1753.3 | CH3CH2 (g) + HBr (g) → C2H6 (g) + Br (g) | ΔrG°(298.15 K) = -11.15 ± 0.25 (×1.542) kcal/mol | Dobis 1997, Seakins 1992, Nicovich 1991, King 1970a, 3rd Law | | 1.5 | 3739.2 | CH3CH2Br (g) → [CH3CH2]+ (g) + Br (g) | ΔrH°(0 K) = 11.130 ± 0.005 eV | Baer 2000 | | 1.4 | 1752.3 | CH3CH2 (g) + HBr (g) → C2H6 (g) + Br (g) | ΔrG°(503 K) = -36.9 ± 1.7 kJ/mol | Seakins 1992, 3rd Law | | 1.4 | 1752.4 | CH3CH2 (g) + HBr (g) → C2H6 (g) + Br (g) | ΔrH°(367 K) = -57.5 ± 1.7 kJ/mol | Seakins 1992, 2nd Law | | 1.2 | 1752.9 | CH3CH2 (g) + HBr (g) → C2H6 (g) + Br (g) | ΔrG°(537 K) = -35.4 ± 1.8 kJ/mol | Seetula 1998, 3rd Law | | 1.1 | 1745.9 | C2H6 (g) → CH3CH2 (g) + H (g) | ΔrH°(0 K) = 416.0 ± 2.1 kJ/mol | Marshall 1999 | | 1.1 | 117.2 | 1/2 O2 (g) + H2 (g) → H2O (cr,l) | ΔrH°(298.15 K) = -285.8261 ± 0.040 kJ/mol | Rossini 1939, Rossini 1931, Rossini 1931b, note H2Oa, Rossini 1930 | | 1.1 | 1746.9 | CH3CH2 (g) + CH4 (g) → CH3 (g) + C2H6 (g) | ΔrH°(0 K) = 16.67 ± 2.1 kJ/mol | Marshall 1999 | | 1.1 | 1754.6 | CH3CH2 (g) + HBr (g) → C2H6 (g) + Br (g) | ΔrH°(298.15 K) = -12.99 ± 0.14 (×3.292) kcal/mol | Dobis 1997, Amphlett 1968, 2nd Law | | 1.0 | 1753.1 | CH3CH2 (g) + HBr (g) → C2H6 (g) + Br (g) | ΔrG°(298.15 K) = -10.51 ± 0.47 kcal/mol | Dobis 1997, Seakins 1992, Nicovich 1991, 3rd Law | | 0.9 | 1779.1 | C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (cr,l) | ΔrH°(298.15 K) = -1411.18 ± 0.30 kJ/mol | Rossini 1937 | | 0.9 | 1741.2 | CH3CH2 (g) → [CH3CH2]+ (g) | ΔrH°(0 K) = 8.12 ± 0.02 eV | Schussler 2005, est unc | | 0.9 | 1752.12 | CH3CH2 (g) + HBr (g) → C2H6 (g) + Br (g) | ΔrH°(298.15 K) = -13.0 ± 0.5 kcal/mol | Dobis 1995, 2nd Law | | 0.9 | 1752.5 | CH3CH2 (g) + HBr (g) → C2H6 (g) + Br (g) | ΔrG°(403 K) = -9.67 ± 0.50 kcal/mol | Nicovich 1991, 3rd Law |
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Top 10 species with enthalpies of formation correlated to the ΔfH° of CH3CH2 (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 | | 38.8 | Ethane | C2H6 (g) |  | -68.29 | -83.91 | ± 0.14 | kJ/mol | 30.0690 ±
0.0017 | 74-84-0*0 | | 33.0 | Ethylene | C2H4 (g) |  | 60.96 | 52.45 | ± 0.13 | kJ/mol | 28.0532 ±
0.0016 | 74-85-1*0 | | 33.0 | Ethylene cation | [C2H4]+ (g) | ![C=[CH2+]](../images/495.png) | 1075.28 | 1068.07 | ± 0.13 | kJ/mol | 28.0526 ±
0.0016 | 34470-02-5*0 | | 29.2 | Propyl | CH3CH2CH2 (g) | ![CC[CH2]](../images/182.png) | 117.92 | 100.81 | ± 0.61 | kJ/mol | 43.0877 ±
0.0024 | 2143-61-5*0 | | 28.9 | Ethylium | [CH3CH2]+ (g) | ![[CH2+]1[CH2][H]1](../images/90.png) | 915.03 | 902.95 | ± 0.32 | kJ/mol | 29.0606 ±
0.0016 | 14936-94-8*0 | | 26.3 | iso-Propyl | CH3CHCH3 (g) | ![C[CH]C](../images/170.png) | 105.28 | 88.68 | ± 0.67 | kJ/mol | 43.0877 ±
0.0024 | 2025-55-0*0 | | 24.4 | Propane | CH3CH2CH3 (g) |  | -82.75 | -105.03 | ± 0.19 | kJ/mol | 44.0956 ±
0.0025 | 74-98-6*0 | | 20.5 | n-Butyl | CH3CH2CH2CH2 (g) | ![CCC[CH2]](../images/443.png) | 101.48 | 78.25 | ± 0.98 | kJ/mol | 57.1143 ±
0.0033 | 2492-36-6*0 | | 19.6 | Propylene | CH3CHCH2 (g) |  | 35.00 | 19.99 | ± 0.22 | kJ/mol | 42.0797 ±
0.0024 | 115-07-1*0 | | 19.6 | Ethyl chloride | CH3CH2Cl (g) |  | -96.76 | -111.35 | ± 0.20 | kJ/mol | 64.5138 ±
0.0019 | 75-00-3*0 |
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Most Influential reactions involving CH3CH2 (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 | | 0.156 | 3197.6 | HC(O)OCH2 (g, anti) + C2H6 (g) → HC(O)OCH3 (g, anti-eclipsed) + CH3CH2 (g) | ΔrH°(0 K) = 2.08 ± 0.8 kcal/mol | Ruscic CBS-n | | 0.156 | 3196.6 | HC(O)OCH2 (g, syn) + C2H6 (g) → HC(O)OCH3 (g, syn-staggered) + CH3CH2 (g) | ΔrH°(0 K) = 0.83 ± 0.8 kcal/mol | Ruscic CBS-n | | 0.143 | 1741.1 | CH3CH2 (g) → [CH3CH2]+ (g) | ΔrH°(0 K) = 8.117 ± 0.008 (×1.215) eV | Ruscic 1989b | | 0.135 | 1741.14 | CH3CH2 (g) → [CH3CH2]+ (g) | ΔrH°(0 K) = 8.124 ± 0.010 eV | Lau 2005 | | 0.123 | 3197.3 | HC(O)OCH2 (g, anti) + C2H6 (g) → HC(O)OCH3 (g, anti-eclipsed) + CH3CH2 (g) | ΔrH°(0 K) = 1.93 ± 0.9 kcal/mol | Ruscic G3X | | 0.123 | 3196.3 | HC(O)OCH2 (g, syn) + C2H6 (g) → HC(O)OCH3 (g, syn-staggered) + CH3CH2 (g) | ΔrH°(0 K) = 0.79 ± 0.9 kcal/mol | Ruscic G3X | | 0.114 | 1763.5 | [CH3CH2]- (g) + CH3 (g) → CH3CH2 (g) + [CH3]- (g) | ΔrH°(0 K) = -0.265 ± 0.039 eV | Ruscic W1RO | | 0.101 | 1835.5 | [CH3C]- (g) + CH3 (g) → [CH]- (g) + CH3CH2 (g) | ΔrH°(0 K) = 0.13 ± 0.9 kcal/mol | Ruscic W1RO | | 0.100 | 3197.1 | HC(O)OCH2 (g, anti) + C2H6 (g) → HC(O)OCH3 (g, anti-eclipsed) + CH3CH2 (g) | ΔrH°(0 K) = 1.91 ± 1.0 kcal/mol | Ruscic G3B3 | | 0.100 | 3197.2 | HC(O)OCH2 (g, anti) + C2H6 (g) → HC(O)OCH3 (g, anti-eclipsed) + CH3CH2 (g) | ΔrH°(0 K) = 1.64 ± 1.0 kcal/mol | Ruscic G3 | | 0.100 | 3197.5 | HC(O)OCH2 (g, anti) + C2H6 (g) → HC(O)OCH3 (g, anti-eclipsed) + CH3CH2 (g) | ΔrH°(0 K) = 2.09 ± 1.0 kcal/mol | Ruscic CBS-n | | 0.100 | 3196.1 | HC(O)OCH2 (g, syn) + C2H6 (g) → HC(O)OCH3 (g, syn-staggered) + CH3CH2 (g) | ΔrH°(0 K) = 0.72 ± 1.0 kcal/mol | Ruscic G3B3 | | 0.100 | 3196.2 | HC(O)OCH2 (g, syn) + C2H6 (g) → HC(O)OCH3 (g, syn-staggered) + CH3CH2 (g) | ΔrH°(0 K) = 0.41 ± 1.0 kcal/mol | Ruscic G3 | | 0.100 | 3196.5 | HC(O)OCH2 (g, syn) + C2H6 (g) → HC(O)OCH3 (g, syn-staggered) + CH3CH2 (g) | ΔrH°(0 K) = 0.99 ± 1.0 kcal/mol | Ruscic CBS-n | | 0.099 | 4064.5 | CH2N(O)O (g) + C2H6 (g) → CH3N(O)O (g) + CH3CH2 (g) | ΔrH°(0 K) = 0.59 ± 0.85 kcal/mol | Ruscic W1RO | | 0.098 | 1837.5 | [CH3C]+ (g) + CH3 (g) → [CH]+ (g) + CH3CH2 (g) | ΔrH°(0 K) = 65.21 ± 0.9 kcal/mol | Ruscic W1RO | | 0.094 | 1763.4 | [CH3CH2]- (g) + CH3 (g) → CH3CH2 (g) + [CH3]- (g) | ΔrH°(0 K) = -0.255 ± 0.043 eV | Ruscic CBS-n | | 0.094 | 1763.2 | [CH3CH2]- (g) + CH3 (g) → CH3CH2 (g) + [CH3]- (g) | ΔrH°(0 K) = -0.229 ± 0.043 eV | Ruscic G4 | | 0.093 | 1827.5 | CH3C (g, quartet) + CH3 (g) → CH (g, quartet) + CH3CH2 (g) | ΔrH°(0 K) = 1.21 ± 0.9 kcal/mol | Ruscic W1RO | | 0.088 | 4064.1 | CH2N(O)O (g) + C2H6 (g) → CH3N(O)O (g) + CH3CH2 (g) | ΔrH°(0 K) = 0.65 ± 0.90 kcal/mol | Ruscic G3X |
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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. 1.122 of the Thermochemical Network (2016); available at ATcT.anl.gov |
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4
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B. Ruscic,
Active Thermochemical Tables: Sequential Bond Dissociation Enthalpies of Methane, Ethane, and Methanol and the Related Thermochemistry.
J. Phys. Chem. A 119, 7810-7837 (2015)
[DOI: 10.1021/acs.jpca.5b01346]
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5
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S. J. Klippenstein, L. B. Harding, and B. Ruscic,
Ab initio Computations and Active Thermochemical Tables Hand in Hand: Heats of Formation of Core Combustion Species.
J. Phys. Chem. A 121, 6580-6602 (2017)
[DOI: 10.1021/acs.jpca.7b05945]
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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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