Selected ATcT [1, 2] enthalpy of formation based on version 1.122h of the Thermochemical Network [3]

This version of ATcT results was generated from an expansion of version 1.122e [4] to include results centered on the determination of the appearance energy of CH3+ from CH4. [5].

Species Name Formula Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Molecular
Mass
ATcT ID
iso-HexaneCH3CH2CH2CH(CH3)2 (g)CCCC(C)C-134.66-173.92± 0.84kJ/mol86.1754 ±
0.0049
107-83-5*0

Top contributors to the provenance of ΔfH° of CH3CH2CH2CH(CH3)2 (g)

The 15 contributors listed below account for 90.5% of the provenance of ΔfH° of CH3CH2CH2CH(CH3)2 (g).

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.

Contribution
(%)
TN
ID
Reaction Measured Quantity Reference
62.63130.1 CH3CH2CH2CH(CH3)2 (cr,l) → CH3CH2CH2CH2CH2CH3 (cr,l) ΔrH°(298.15 K) = 1.30 ± 0.21 kcal/molProsen 1941
3.23128.2 CH3CH2CH2CH(CH3)2 (g) CH3CH2CH2CH2CH3 (g) → CH3CH2CH2CH2CH2CH3 (g) CH3CH2CH(CH3)2 (g) ΔrH°(0 K) = -0.11 ± 0.90 kcal/molRuscic G4
3.23128.4 CH3CH2CH2CH(CH3)2 (g) CH3CH2CH2CH2CH3 (g) → CH3CH2CH2CH2CH2CH3 (g) CH3CH2CH(CH3)2 (g) ΔrH°(0 K) = -0.01 ± 0.90 kcal/molRuscic CBS-n
3.23128.1 CH3CH2CH2CH(CH3)2 (g) CH3CH2CH2CH2CH3 (g) → CH3CH2CH2CH2CH2CH3 (g) CH3CH2CH(CH3)2 (g) ΔrH°(0 K) = -0.09 ± 0.90 kcal/molRuscic G3X
2.63128.3 CH3CH2CH2CH(CH3)2 (g) CH3CH2CH2CH2CH3 (g) → CH3CH2CH2CH2CH2CH3 (g) CH3CH2CH(CH3)2 (g) ΔrH°(0 K) = -0.11 ± 1.0 kcal/molRuscic CBS-n
2.53125.2 CH3CH2CH2CH2CH2CH3 (cr,l) + 19/2 O2 (g) → 6 CO2 (g) + 7 H2O (cr,l) ΔrH°(298.15 K) = -995.01 ± 0.13 kcal/molGood 1969
1.6118.2 1/2 O2 (g) H2 (g) → H2O (cr,l) ΔrH°(298.15 K) = -285.8261 ± 0.040 kJ/molRossini 1939, Rossini 1931, Rossini 1931b, note H2Oa, Rossini 1930
1.63127.5 CH3CH2CH2CH(CH3)2 (g) → CH3CH2CH2CH2CH2CH3 (g) ΔrH°(0 K) = 1.31 ± 1.3 kcal/molRuscic CBS-n
1.63127.3 CH3CH2CH2CH(CH3)2 (g) → CH3CH2CH2CH2CH2CH3 (g) ΔrH°(0 K) = 1.38 ± 1.3 kcal/molRuscic G4
1.53125.3 CH3CH2CH2CH2CH2CH3 (cr,l) + 19/2 O2 (g) → 6 CO2 (g) + 7 H2O (cr,l) ΔrH°(298.15 K) = -995.00 ± 0.17 kcal/molJessup 1937, Prosen 1945
1.43126.2 CH3CH2CH2CH(CH3)2 (g) → 6 C (g) + 14 H (g) ΔrH°(0 K) = 1774.38 ± 1.60 kcal/molRuscic G4
1.43127.2 CH3CH2CH2CH(CH3)2 (g) → CH3CH2CH2CH2CH2CH3 (g) ΔrH°(0 K) = 1.39 ± 1.4 kcal/molRuscic G3X
1.23126.1 CH3CH2CH2CH(CH3)2 (g) → 6 C (g) + 14 H (g) ΔrH°(0 K) = 1774.39 ± 1.72 kcal/molRuscic G3X
1.13152.1 CH2CHCH2CH2CHCH2 (g) + 2 H2 (g) → CH3CH2CH2CH2CH2CH3 (g) ΔrH°(355.15 K) = -60.525 ± 0.150 kcal/molKistiakowsky 1936, Cox 1970
1.13125.1 CH3CH2CH2CH2CH2CH3 (cr,l) + 19/2 O2 (g) → 6 CO2 (g) + 7 H2O (cr,l) ΔrH°(298.15 K) = -4162.98 ± 0.83 kJ/molProsen 1944b

Top 10 species with enthalpies of formation correlated to the ΔfH° of CH3CH2CH2CH(CH3)2 (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.


Correlation
Coefficent
(%)
Species Name Formula Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Molecular
Mass
ATcT ID
99.5 iso-HexaneCH3CH2CH2CH(CH3)2 (cr,l)CCCC(C)C-180.36-204.02± 0.83kJ/mol86.1754 ±
0.0049
107-83-5*500
39.0 n-HexaneCH3CH2CH2CH2CH2CH3 (cr,l)CCCCCC-179.98-198.64± 0.34kJ/mol86.1754 ±
0.0049
110-54-3*500
38.7 n-HexaneCH3CH2CH2CH2CH2CH3 (g)CCCCCC-130.05-166.92± 0.34kJ/mol86.1754 ±
0.0049
110-54-3*0
19.9 WaterH2O (g)O-238.932-241.836± 0.027kJ/mol18.01528 ±
0.00033
7732-18-5*0
19.9 WaterH2O (cr, l, eq.press.)O-286.304-285.832± 0.027kJ/mol18.01528 ±
0.00033
7732-18-5*499
19.9 WaterH2O (l, eq.press.)O-285.832± 0.027kJ/mol18.01528 ±
0.00033
7732-18-5*589
19.9 WaterH2O (l)O-285.830± 0.027kJ/mol18.01528 ±
0.00033
7732-18-5*590
19.9 Oxonium[H3O]+ (aq)[OH3+]-285.830± 0.027kJ/mol19.02267 ±
0.00037
13968-08-6*800
19.9 WaterH2O (cr,l)O-286.302-285.830± 0.027kJ/mol18.01528 ±
0.00033
7732-18-5*500
19.9 WaterH2O (g, para)O-238.932-241.836± 0.027kJ/mol18.01528 ±
0.00033
7732-18-5*2

Most Influential reactions involving CH3CH2CH2CH(CH3)2 (g)

Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.

Influence
Coefficient
TN
ID
Reaction Measured Quantity Reference
0.9983129.1 CH3CH2CH2CH(CH3)2 (cr,l) → CH3CH2CH2CH(CH3)2 (g) ΔrH°(298.15 K) = 30.10 ± 0.08 kJ/molMajer 1985
0.0503128.4 CH3CH2CH2CH(CH3)2 (g) CH3CH2CH2CH2CH3 (g) → CH3CH2CH2CH2CH2CH3 (g) CH3CH2CH(CH3)2 (g) ΔrH°(0 K) = -0.01 ± 0.90 kcal/molRuscic CBS-n
0.0503128.2 CH3CH2CH2CH(CH3)2 (g) CH3CH2CH2CH2CH3 (g) → CH3CH2CH2CH2CH2CH3 (g) CH3CH2CH(CH3)2 (g) ΔrH°(0 K) = -0.11 ± 0.90 kcal/molRuscic G4
0.0503128.1 CH3CH2CH2CH(CH3)2 (g) CH3CH2CH2CH2CH3 (g) → CH3CH2CH2CH2CH2CH3 (g) CH3CH2CH(CH3)2 (g) ΔrH°(0 K) = -0.09 ± 0.90 kcal/molRuscic G3X
0.0403128.3 CH3CH2CH2CH(CH3)2 (g) CH3CH2CH2CH2CH3 (g) → CH3CH2CH2CH2CH2CH3 (g) CH3CH2CH(CH3)2 (g) ΔrH°(0 K) = -0.11 ± 1.0 kcal/molRuscic CBS-n
0.0193127.3 CH3CH2CH2CH(CH3)2 (g) → CH3CH2CH2CH2CH2CH3 (g) ΔrH°(0 K) = 1.38 ± 1.3 kcal/molRuscic G4
0.0193127.5 CH3CH2CH2CH(CH3)2 (g) → CH3CH2CH2CH2CH2CH3 (g) ΔrH°(0 K) = 1.31 ± 1.3 kcal/molRuscic CBS-n
0.0173127.2 CH3CH2CH2CH(CH3)2 (g) → CH3CH2CH2CH2CH2CH3 (g) ΔrH°(0 K) = 1.39 ± 1.4 kcal/molRuscic G3X
0.0163126.2 CH3CH2CH2CH(CH3)2 (g) → 6 C (g) + 14 H (g) ΔrH°(0 K) = 1774.38 ± 1.60 kcal/molRuscic G4
0.0143126.1 CH3CH2CH2CH(CH3)2 (g) → 6 C (g) + 14 H (g) ΔrH°(0 K) = 1774.39 ± 1.72 kcal/molRuscic G3X
0.0133127.4 CH3CH2CH2CH(CH3)2 (g) → CH3CH2CH2CH2CH2CH3 (g) ΔrH°(0 K) = 1.31 ± 1.6 kcal/molRuscic CBS-n


References
1   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]
2   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]
3   B. Ruscic and D. H. Bross,
Active Thermochemical Tables (ATcT) values based on ver. 1.122h of the Thermochemical Network (2020); available at ATcT.anl.gov
4   J. P. Porterfield, D. H. Bross, B. Ruscic, J. H. Thorpe, T. L. Nguyen, J. H. Baraban, J. F. Stanton, J. W. Daily, and G. B. Ellison,
Thermal Decomposition of Potential Ester Biofuels, Part I: Methyl Acetate and Methyl Butanoate.
J. Chem. Phys. A 121, 4658-4677 (2017) [DOI: 10.1021/acs.jpca.7b02639] (Veronica Vaida Festschrift)
5   Y.-C. Chang, B. Xiong, D. H. Bross, B. Ruscic, and C. Y. Ng,
A Vacuum Ultraviolet laser Pulsed Field Ionization-Photoion Study of Methane (CH4): Determination of the Appearance Energy of Methylium From Methane with Unprecedented Precision and the Resulting Impact on the Bond Dissociation Energies of CH4 and CH4+.
Phys. Chem. Chem. Phys. 19, 9592-9605 (2017) [DOI: 10.1039/c6cp08200a] (part of 2017 PCCP Hot Articles collection)
6   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]

Formula
The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.

Uncertainties
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.

Website Functionality Credits
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/.

Acknowledgement
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.