Selected ATcT [1, 2] enthalpy of formation based on version 1.176 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.172 to include species related to Criegee intermediates that are involved in several ongoing studies[4].

Sulfurous acid

Formula: S(O)(OH)2 (g)

CAS RN: 7782-99-2

ATcT ID: 7782-99-2*0

SMILES: O=S(O)O

InChI: InChI=1S/H2O3S/c1-4(2)3/h(H2,1,2,3)

InChIKey: LSNNMFCWUKXFEE-UHFFFAOYSA-N

Hills Formula: H2O3S1

2D Image:

Aliases: S(O)(OH)2; Sulfurous acid; OS(OH)2; (SO)(OH)2; SO(OH)2; O2S(OH)2; H2SO3

Relative Molecular Mass: 82.0801 ± 0.0061

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
-511.32	-520.82	± 0.89	kJ/mol

3D Image of S(O)(OH)2 (g)

spin ON spin OFF

Top contributors to the provenance of Δ_fH° of S(O)(OH)2 (g)

The 15 contributors listed below account for 90.0% of the provenance of Δ_fH° of S(O)(OH)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
68.6	9675.5	S(O)(OH)2 (g, cis) → H2O (g) + OSO (g)	Δ_rH°(0 K) = -5.27 ± 0.25 kcal/mol	Misiewicz 2020, est unc
2.6	9676.4	S(O)(OH)2 (g, cis) + OS(O)O (g) → OS(O)(OH)2 (g) + OSO (g)	Δ_rH°(0 K) = -25.28 ± 0.85 kcal/mol	Ruscic W1RO
2.4	9676.2	S(O)(OH)2 (g, cis) + OS(O)O (g) → OS(O)(OH)2 (g) + OSO (g)	Δ_rH°(0 K) = -26.28 ± 0.90 kcal/mol	Ruscic G4
2.4	9676.1	S(O)(OH)2 (g, cis) + OS(O)O (g) → OS(O)(OH)2 (g) + OSO (g)	Δ_rH°(0 K) = -26.14 ± 0.90 kcal/mol	Ruscic G3X
1.9	9676.3	S(O)(OH)2 (g, cis) + OS(O)O (g) → OS(O)(OH)2 (g) + OSO (g)	Δ_rH°(0 K) = -25.54 ± 1.00 kcal/mol	Ruscic CBS-n
1.9	9675.4	S(O)(OH)2 (g, cis) → H2O (g) + OSO (g)	Δ_rH°(0 K) = -4.56 ± 1.50 kcal/mol	Ruscic W1RO
1.6	9675.2	S(O)(OH)2 (g, cis) → H2O (g) + OSO (g)	Δ_rH°(0 K) = -5.77 ± 1.60 kcal/mol	Ruscic G4
1.4	9675.1	S(O)(OH)2 (g, cis) → H2O (g) + OSO (g)	Δ_rH°(0 K) = -5.89 ± 1.72 kcal/mol	Ruscic G3X
1.3	9716.4	S(O)(OH)2 (g) → OS(OH)O (g) + H (g)	Δ_rH°(0 K) = 86.92 ± 1.50 kcal/mol	Ruscic W1RO
1.1	9716.2	S(O)(OH)2 (g) → OS(OH)O (g) + H (g)	Δ_rH°(0 K) = 85.30 ± 1.60 kcal/mol	Ruscic G4
1.0	9706.4	[OS(OH)O]- (g) → OS(OH)O (g)	Δ_rH°(0 K) = 3.303 ± 0.050 eV	Ruscic W1RO
0.9	9716.1	S(O)(OH)2 (g) → OS(OH)O (g) + H (g)	Δ_rH°(0 K) = 86.31 ± 1.72 kcal/mol	Ruscic G3X
0.9	9675.3	S(O)(OH)2 (g, cis) → H2O (g) + OSO (g)	Δ_rH°(0 K) = -5.94 ± 2.16 kcal/mol	Ruscic CBS-n
0.8	9557.8	OS(O)(OH)2 (g) → H2O (g) + OS(O)O (g)	Δ_rG°(670 K) = -1.9 ± 3.0 kJ/mol	Bodenstein 1909, Bodenstein 1909a, Gurvich TPIS, 3rd Law, est unc
0.7	9416.1	S (cr,l) + O2 (g) → OSO (g)	Δ_rH°(298.15 K) = -296.847 ± 0.200 kJ/mol	Eckman 1929, note SO2

Top 10 species with enthalpies of formation correlated to the Δ_fH° of S(O)(OH)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	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
100.0	Sulfurous acid	S(O)(OH)2 (g, cis)	-511.32	-521.53	± 0.89	kJ/mol	82.0801 ± 0.0061	7782-99-2*2
70.3	Sulfurous acid	S(O)(OH)2 (g, trans)	-507.1	-517.7	± 1.3	kJ/mol	82.0801 ± 0.0061	7782-99-2*1
66.9	Sulfonic acid	SH(O)(O)OH (g)	-482.2	-494.8	± 1.4	kJ/mol	82.0801 ± 0.0061	7782-99-20
64.5	Sulfurous acid	S(O)(OH)2 (g, gauche)	-497.5	-507.5	± 1.4	kJ/mol	82.0801 ± 0.0061	7782-99-2*3
36.2	Hydrogen sulfite	[OS(OH)O]- (g)	-684.8	-692.1	± 1.8	kJ/mol	81.0727 ± 0.0061	15181-46-1*0
27.3	Sulfuric acid	OS(O)(OH)2 (g)	-715.5	-729.7	± 1.1	kJ/mol	98.0795 ± 0.0061	7664-93-9*0
15.9	Sulfo	OS(OH)O (g)	-366.9	-374.7	± 1.1	kJ/mol	81.0721 ± 0.0061	32750-86-0*0
13.7	Sulfur dioxide	OSO (g)	-294.20	-296.74	± 0.13	kJ/mol	64.0648 ± 0.0060	7446-09-5*0
13.7	Sulfur monoxide	SO (g)	5.95	6.00	± 0.13	kJ/mol	48.0654 ± 0.0060	13827-32-2*0
13.5	Oxosulfur	[SO]+ (g)	999.26	999.87	± 0.13	kJ/mol	48.0649 ± 0.0060	767269-11-4*0

Most Influential reactions involving S(O)(OH)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
1.000	9672.1	S(O)(OH)2 (g) → S(O)(OH)2 (g, cis)	Δ_rH°(0 K) = 0 ± 0 cm-1	Misiewicz 2020, Ruscic W1RO, Ruscic G4, Ruscic CBS-n
0.039	9716.4	S(O)(OH)2 (g) → OS(OH)O (g) + H (g)	Δ_rH°(0 K) = 86.92 ± 1.50 kcal/mol	Ruscic W1RO
0.034	9716.2	S(O)(OH)2 (g) → OS(OH)O (g) + H (g)	Δ_rH°(0 K) = 85.30 ± 1.60 kcal/mol	Ruscic G4
0.029	9716.1	S(O)(OH)2 (g) → OS(OH)O (g) + H (g)	Δ_rH°(0 K) = 86.31 ± 1.72 kcal/mol	Ruscic G3X
0.019	9716.3	S(O)(OH)2 (g) → OS(OH)O (g) + H (g)	Δ_rH°(0 K) = 85.10 ± 2.16 kcal/mol	Ruscic 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 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. 1.176 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		T. L. Nguyen et al, ongoing studies (2024)
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.