Selected ATcT [1, 2] enthalpy of formation based on version 1.172 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.156 to include species relevant to a study of photodissociation of formamide[4].

Dioxygen

Formula: O2 (aq, undissoc)
CAS RN: 7782-44-7
ATcT ID: 7782-44-7*1000
SMILES: O=O
InChI: InChI=1S/O2/c1-2
InChIKey: MYMOFIZGZYHOMD-UHFFFAOYSA-N
Hills Formula: O2

2D Image:

O=O
Aliases: O2; Dioxygen; Oxygen molecule; Molecular oxygen; Diatomic oxygen; Oxygen; 1,2-Dioxidanediyl; Dioxidane-1,2-diyl; Dioxidanediyl
Relative Molecular Mass: 31.99880 ± 0.00060

   ΔfH°(0 K)   ΔfH°(298.15 K)UncertaintyUnits
-11.963± 0.041kJ/mol

Top contributors to the provenance of ΔfH° of O2 (aq, undissoc)

The 4 contributors listed below account for 90.6% of the provenance of ΔfH° of O2 (aq, undissoc).

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
51.715.1 O2 (g) → O2 (aq, undissoc) ΔrG°(298.15 K) = 16.558 ± 0.05 kJ/molRettich 2000, Clever 2014
12.915.3 O2 (g) → O2 (aq, undissoc) ΔrG°(298.15 K) = 16.566 ± 0.10 kJ/molBattino 1981
12.915.5 O2 (g) → O2 (aq, undissoc) ΔrG°(298.15 K) = 16.557 ± 0.10 kJ/molBenson 1979, Xing 2014
12.915.7 O2 (g) → O2 (aq, undissoc) ΔrG°(298.15 K) = 16.56 ± 0.10 kJ/molBattino 1983


Most Influential reactions involving O2 (aq, undissoc)

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
0.51715.1 O2 (g) → O2 (aq, undissoc) ΔrG°(298.15 K) = 16.558 ± 0.05 kJ/molRettich 2000, Clever 2014
0.12915.7 O2 (g) → O2 (aq, undissoc) ΔrG°(298.15 K) = 16.56 ± 0.10 kJ/molBattino 1983
0.12915.5 O2 (g) → O2 (aq, undissoc) ΔrG°(298.15 K) = 16.557 ± 0.10 kJ/molBenson 1979, Xing 2014
0.12915.3 O2 (g) → O2 (aq, undissoc) ΔrG°(298.15 K) = 16.566 ± 0.10 kJ/molBattino 1981
0.05715.10 O2 (g) → O2 (aq, undissoc) ΔrG°(298.15 K) = 16.67 ± 0.15 kJ/molXing 2014
0.02015.2 O2 (g) → O2 (aq, undissoc) ΔrH°(298.15 K) = -11.969 ± 0.25 kJ/molRettich 2000, Clever 2014
0.00515.6 O2 (g) → O2 (aq, undissoc) ΔrH°(298.15 K) = -12.015 ± 0.50 kJ/molBenson 1979, Xing 2014
0.00515.4 O2 (g) → O2 (aq, undissoc) ΔrH°(298.15 K) = -12.114 ± 0.50 kJ/molBattino 1981
0.00515.8 O2 (g) → O2 (aq, undissoc) ΔrH°(298.15 K) = -12.11 ± 0.50 kJ/molBattino 1983
0.00015.11 O2 (g) → O2 (aq, undissoc) ΔrG°(298.15 K) = 16.4 ± 4.00 kJ/molNBS Tables 1989
0.00015.12 O2 (g) → O2 (aq, undissoc) ΔrH°(298.15 K) = -11.7 ± 4.00 kJ/molNBS Tables 1989

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. 1.172 of the Thermochemical Network (2024); available at ATcT.anl.gov
4   K. L. Caster, N. A. Seifert, B. Ruscic, A. W. Jasper, and K. Prozument,
Dynamics of HCN, NHC, and HNCO Formation in the 193 nm Photodissociation of Formamide
J. Phys. Chem. A (in press) (2024) [DOI: 10.1021/acs.jpca.4c02232]
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.