Selected ATcT [1, 2] enthalpy of formation based on version 1.148 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.140 to include species relevant to a recent study of the role of atmospheric methanediol[4].

Propionic acid

Formula: CH3CH2C(O)OH (cr,l)

CAS RN: 79-09-4

ATcT ID: 79-09-4*500

SMILES: CCC(=O)O

InChI: InChI=1S/C3H6O2/c1-2-3(4)5/h2H2,1H3,(H,4,5)

InChIKey: XBDQKXXYIPTUBI-UHFFFAOYSA-N

Hills Formula: C3H6O2

2D Image:

Aliases: CH3CH2C(O)OH; Propionic acid; Propanoic acid; Ethanecarboxylic acid; Ethylformic acid; Metacetonic acid; Methylacetic acid; Carboxyethane; Pseudoacetic acid; Adofeed; Antischim B; Luprosil; MonoProp; Propcorn; Propkorn; Prozoin; Toxi-Check

Relative Molecular Mass: 74.0785 ± 0.0025

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
-505.38	-509.52	± 0.17	kJ/mol

Top contributors to the provenance of Δ_fH° of CH3CH2C(O)OH (cr,l)

The 9 contributors listed below account for 90.1% of the provenance of Δ_fH° of CH3CH2C(O)OH (cr,l).

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
78.8	5137.2	CH3CH2C(O)OH (cr,l) + 7/2 O2 (g) → 3 CO2 (g) + 3 H2O (cr,l)	Δ_rH°(298.15 K) = -365.266 ± 0.037 kcal/mol	Lebedeva 1964
4.0	125.2	1/2 O2 (g) + H2 (g) → H2O (cr,l)	Δ_rH°(298.15 K) = -285.8261 ± 0.040 kJ/mol	Rossini 1939, Rossini 1931, Rossini 1931b, note H2Oa, Rossini 1930
1.9	2290.1	2 H2 (g) + C (graphite) → CH4 (g)	Δ_rG°(1165 K) = 37.521 ± 0.068 kJ/mol	Smith 1946, note COf, 3rd Law
1.6	2145.7	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(298.15 K) = -393.464 ± 0.024 kJ/mol	Hawtin 1966, note CO2e
1.5	2288.7	CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (cr,l)	Δ_rH°(298.15 K) = -890.578 ± 0.078 kJ/mol	Schley 2010
0.6	2145.4	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(298.15 K) = -393.462 ± 0.038 kJ/mol	Lewis 1965, note CO2d
0.6	2145.5	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(298.15 K) = -393.468 ± 0.038 kJ/mol	Fraser 1952, note CO2f
0.4	2145.11	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(298.15 K) = -94.051 ± 0.011 kcal/mol	Prosen 1944a, Cox 1970, NBS TN270, NBS Tables 1989
0.3	2145.6	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(298.15 K) = -393.462 ± 0.056 kJ/mol	Hawtin 1966, note CO2e

Top 10 species with enthalpies of formation correlated to the Δ_fH° of CH3CH2C(O)OH (cr,l)

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	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
40.6	Carbonic acid	C(O)(OH)2 (aq, undissoc)		-698.670	± 0.028	kJ/mol	62.0248 ± 0.0012	463-79-6*1000
36.5	Water	H2O (g, ortho)	-238.620	-241.808	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*1
36.5	Water	H2O (g, para)	-238.905	-241.808	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*2
36.5	Water	H2O (g)	-238.905	-241.808	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*0
36.5	Water	H2O (cr, l, eq.press.)	-286.276	-285.804	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*499
36.5	Water	H2O (l, eq.press.)		-285.804	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*589
36.5	Oxonium	[H3O]+ (aq)		-285.802	± 0.022	kJ/mol	19.02267 ± 0.00037	13968-08-6*800
36.5	Water	H2O (l)		-285.802	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*590
36.5	Water	H2O (cr,l)	-286.274	-285.802	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*500
36.5	Water	H2O (cr)	-286.274	-292.715	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*510

Most Influential reactions involving CH3CH2C(O)OH (cr,l)

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
0.980	5137.2	CH3CH2C(O)OH (cr,l) + 7/2 O2 (g) → 3 CO2 (g) + 3 H2O (cr,l)	Δ_rH°(298.15 K) = -365.266 ± 0.037 kcal/mol	Lebedeva 1964
0.337	5138.2	CH3CH2C(O)OH (cr,l) → CH3CH2C(O)OH (g)	Δ_rH°(298.15 K) = 54.88 ± 1. kJ/mol	Chickos 1995, est unc
0.219	5138.3	CH3CH2C(O)OH (cr,l) → CH3CH2C(O)OH (g)	Δ_rH°(298.15 K) = 54.5 ± 1. (×1.242) kJ/mol	Verevkin 2000, note unc2
0.084	5138.1	CH3CH2C(O)OH (cr,l) → CH3CH2C(O)OH (g)	Δ_rH°(298.15 K) = 55. ± 2. kJ/mol	Majer 1985, Konicek 1970
0.003	5137.1	CH3CH2C(O)OH (cr,l) + 7/2 O2 (g) → 3 CO2 (g) + 3 H2O (cr,l)	Δ_rH°(298.15 K) = -365.2 ± 0.6 kcal/mol	Schjanberg 1935, as quoted by NIST WebBook

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 21^st 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. 1.148 of the Thermochemical Network (2023); available at ATcT.anl.gov
4		T. L. Nguyen, J. Peeters, J.-F. Müller, A. Perera, D. H. Bross, B. Ruscic, and J. F. Stanton, Methanediol from Cloud-Processed Formaldehyde is Only a Minor Source of Atmospheric Formic Acid Natl. Acad. Sci. 120, e2304650120/1-8 (2023) [DOI: 10.1073/pnas.2304650120]
5		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]
6		B. Ruscic and D. H. Bross, Thermochemistry Computer Aided Chem. Eng. 45, 3-114 (2019) [DOI: 10.1016/B978-0-444-64087-1.00001-2]

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 [5] and Ruscic and Bross[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.