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].

Sulfur dioxide

Formula: OSO (aq, undissoc)

CAS RN: 7446-09-5

ATcT ID: 7446-09-5*1000

SMILES: O=S=O

InChI: InChI=1S/O2S/c1-3-2

InChIKey: RAHZWNYVWXNFOC-UHFFFAOYSA-N

Hills Formula: O2S1

2D Image:

Aliases: OSO; Sulfur dioxide; Oxosulfane oxide; Dioxo-lambda4-sulfane; Sulfurous oxide; Sulfurous anhydride; Sulfurous acid anhydride; Sulfur oxide; E 220

Relative Molecular Mass: 64.0648 ± 0.0060

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
	-320.69	± 0.14	kJ/mol

Top contributors to the provenance of Δ_fH° of OSO (aq, undissoc)

The 8 contributors listed below account for 90.1% of the provenance of Δ_fH° of OSO (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
31.9	9023.1	S (cr,l) + O2 (g) → OSO (g)	Δ_rH°(298.15 K) = -296.847 ± 0.200 kJ/mol	Eckman 1929, note SO2
17.1	9152.1	S (cr,l) + 3/2 O2 (g) + H2O (cr,l) → OS(O)(OH)2 (aq, 115 H2O)	Δ_rH°(298.15 K) = -143.85 ± 0.06 kcal/mol	Good 1960, CODATA Key Vals
12.9	9029.1	OSO (g) → OSO (aq, undissoc)	Δ_rG°(298.15 K) = -0.738 ± 0.05 kJ/mol	Young 1983
12.5	9152.2	S (cr,l) + 3/2 O2 (g) + H2O (cr,l) → OS(O)(OH)2 (aq, 115 H2O)	Δ_rH°(298.15 K) = -143.92 ± 0.07 kcal/mol	Mansson 1963, CODATA Key Vals
5.0	9191.1	S (cr,l) + 3/2 O2 (g) + H2O (cr,l) → OS(O)(OH)2 (aq, 45 H2O)	Δ_rH°(298.15 K) = -143.67 ± 0.11 kcal/mol	McCullough 1957a
3.9	9008.2	2 S (cr,l) → S2 (g)	Δ_rG°(570 K) = 9.483 ± 0.138 (×1.915) kcal/mol	Drowart 1968, Detry 1967, 3rd Law
3.4	9151.1	S (cr,l) + 3/2 O2 (g) + H2O (cr,l) → OS(O)(OH)2 (aq, 70 H2O)	Δ_rH°(298.15 K) = -143.58 ± 0.09 (×1.477) kcal/mol	McCullough 1953, CODATA Key Vals
2.9	9008.4	2 S (cr,l) → S2 (g)	Δ_rG°(600 K) = 8.57 ± 0.29 (×1.044) kcal/mol	Braune 1951, West 1929, Gurvich TPIS, 3rd Law

Top 10 species with enthalpies of formation correlated to the Δ_fH° of OSO (aq, undissoc)

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°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
98.6	Sulfurous acid	S(O)(OH)2 (aq, undissoc)	-606.49	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*1000
94.4	Sulfurous acid	S(O)(OH)2 (aq, 2500 H2O)	-617.30	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*898
94.4	Sulfurous acid	S(O)(OH)2 (aq, 500 H2O)	-613.26	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*833
94.4	Sulfurous acid	S(O)(OH)2 (aq, 400 H2O)	-612.76	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*832
94.4	Sulfurous acid	S(O)(OH)2 (aq, 2000 H2O)	-616.74	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*841
94.4	Sulfurous acid	S(O)(OH)2 (aq, 1500 H2O)	-615.98	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*840
94.4	Sulfurous acid	S(O)(OH)2 (aq, 750 H2O)	-614.20	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*836
94.4	Sulfurous acid	S(O)(OH)2 (aq, 300 H2O)	-612.16	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*831
94.4	Sulfurous acid	S(O)(OH)2 (aq, 200 H2O)	-611.35	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*830
94.4	Sulfurous acid	S(O)(OH)2 (aq, 100 H2O)	-610.09	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*828

Most Influential reactions involving OSO (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
1.000	9268.1	OSO (aq, undissoc) + H2O (cr,l) → S(O)(OH)2 (aq, undissoc)	Δ_rH°(298.15 K) = 0 ± 0 cm-1	triv
0.960	9270.1	OSO (aq, undissoc) + H2O (cr,l) → [OS(OH)O]- (aq, undissoc) + H+ (aq)	Δ_rG°(298.15 K) = 10.508 ± 0.05 kJ/mol	Kawazuishi 1987
0.949	9029.1	OSO (g) → OSO (aq, undissoc)	Δ_rG°(298.15 K) = -0.738 ± 0.05 kJ/mol	Young 1983
0.026	9270.2	OSO (aq, undissoc) + H2O (cr,l) → [OS(OH)O]- (aq, undissoc) + H+ (aq)	Δ_rH°(298.15 K) = -25.335 ± 0.30 kJ/mol	Kawazuishi 1987
0.026	9029.2	OSO (g) → OSO (aq, undissoc)	Δ_rH°(298.15 K) = -23.949 ± 0.30 kJ/mol	Young 1983
0.014	9029.3	OSO (g) → OSO (aq, undissoc)	Δ_rG°(298.15 K) = -0.482 ± 0.40 kJ/mol	NBS Tables 1989, NBS TN270, est unc
0.013	9270.3	OSO (aq, undissoc) + H2O (cr,l) → [OS(OH)O]- (aq, undissoc) + H+ (aq)	Δ_rG°(298.15 K) = 10.08 ± 0.40 (×1.067) kJ/mol	NBS Tables 1989
0.000	9029.4	OSO (g) → OSO (aq, undissoc)	Δ_rH°(298.15 K) = -26.150 ± 0.40 (×5.536) kJ/mol	NBS Tables 1989, NBS TN270, est unc

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.