Selected ATcT [1, 2] enthalpy of formation based on version 1.124 of the Thermochemical Network [3]

This version of ATcT results was generated by additional expansion of version 1.122x [4] to include additional information relevant to the study of thermophysical and thermochemical properties of CH2 and CH3 using nonrigid rotor anharmonic oscillator (NRRAO) partition functions [5], the development and benchmarking of a state-of-the-art computational approach that aims to reproduce total atomization energies of small molecules within 10–15 cm^-1 [6], as well as the study of the reversible reaction C₂H₃ + H₂ ⇌ C₂H₄ + H ⇌ C₂H₅ [7]

Sulfurous acid

Formula: S(O)(OH)2 (aq, 10000 H2O)

CAS RN: 7782-99-2

ATcT ID: 7782-99-2*850

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
	-622.79	± 0.14	kJ/mol

Top contributors to the provenance of Δ_fH° of S(O)(OH)2 (aq, 10000 H2O)

The 9 contributors listed below account for 91.0% of the provenance of Δ_fH° of S(O)(OH)2 (aq, 10000 H2O).

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	8101.1	S (cr,l) + O2 (g) → OSO (g)	Δ_rH°(298.15 K) = -296.847 ± 0.200 kJ/mol	Eckman 1929, note SO2
17.6	8205.1	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
9.5	8205.2	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 (×1.164) kcal/mol	Mansson 1963, CODATA Key Vals
7.8	8303.1	S(O)(OH)2 (aq, undissoc) → S(O)(OH)2 (aq, 2500 H2O)	Δ_rH°(298.15 K) = -10.80 ± 0.040 kJ/mol	NBS Tables 1989, NBS TN270
7.8	8107.1	OSO (g) → OSO (aq, undissoc)	Δ_rH°(298.15 K) = -26.150 ± 0.040 kJ/mol	NBS Tables 1989, NBS TN270
5.0	8086.2	2 S (cr,l) → S2 (g)	Δ_rG°(570 K) = 9.483 ± 0.138 (×1.682) kcal/mol	Drowart 1968, Detry 1967, 3rd Law
4.6	8204.1	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 (×1.297) kcal/mol	McCullough 1953, CODATA Key Vals
3.2	8086.4	2 S (cr,l) → S2 (g)	Δ_rG°(600 K) = 8.57 ± 0.29 kcal/mol	Braune 1951, West 1929, Gurvich TPIS, 3rd Law
3.1	8205.3	S (cr,l) + 3/2 O2 (g) + H2O (cr,l) → OS(O)(OH)2 (aq, 115 H2O)	Δ_rH°(298.15 K) = -143.70 ± 0.07 (×2.044) kcal/mol	Waddington 1956, Mansson 1963, est unc

Top 10 species with enthalpies of formation correlated to the Δ_fH° of S(O)(OH)2 (aq, 10000 H2O)

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
99.9	Sulfurous acid	S(O)(OH)2 (aq, 2500 H2O)	-619.41	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*898
99.9	Sulfurous acid	S(O)(OH)2 (aq, 3500 H2O)	-620.30	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*899
99.9	Sulfurous acid	S(O)(OH)2 (aq, 3000 H2O)	-619.89	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*842
99.9	Sulfurous acid	S(O)(OH)2 (aq, 2000 H2O)	-618.85	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*841
99.9	Sulfurous acid	S(O)(OH)2 (aq, 1500 H2O)	-618.10	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*840
99.9	Sulfurous acid	S(O)(OH)2 (aq, 1000 H2O)	-617.01	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*839
99.9	Sulfurous acid	S(O)(OH)2 (aq, 750 H2O)	-616.32	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*836
99.9	Sulfurous acid	S(O)(OH)2 (aq, 500 H2O)	-615.38	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*833
99.9	Sulfurous acid	S(O)(OH)2 (aq, 400 H2O)	-614.87	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*832
99.9	Sulfurous acid	S(O)(OH)2 (aq, 300 H2O)	-614.27	± 0.14	kJ/mol	82.0801 ± 0.0061	7782-99-2*831

Most Influential reactions involving S(O)(OH)2 (aq, 10000 H2O)

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	8320.1	S(O)(OH)2 (aq, 2500 H2O) → S(O)(OH)2 (aq, 10000 H2O)	Δ_rH°(298.15 K) = -3.380 ± 0.004 kJ/mol	NBS Tables 1989, NBS TN270

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. 1.124 of the Thermochemical Network, Argonne National Laboratory, Lemont, Illinois 2022; available at ATcT.anl.gov [DOI: 10.17038/CSE/1885923]
4		Y. Ren, L. Zhou, A. Mellouki, V. Daële, M. Idir, S. S. Brown, B. Ruscic, Robert S. Paton, M. R. McGillen, and A. R. Ravishankara, Reactions of NO3 with Aromatic Aldehydes: Gas-Phase Kinetics and Insights into the Mechanism of the Reaction. Atmos. Chem. Phys. 21, 13537-13551 (2021) [DOI: 10.5194/acp2021-228]
5		B. Ruscic and D. H. Bross, Active Thermochemical Tables: The Thermophysical and Thermochemical Properties of Methyl, CH3, and Methylene, CH2, Corrected for Nonrigid Rotor and Anharmonic Oscillator Effects. Mol. Phys. e1969046 (2021) [DOI: 10.1080/00268976.2021.1969046]
6		J. H. Thorpe, J. L. Kilburn, D. Feller, P. B. Changala, D. H. Bross, B. Ruscic, and J. F. Stanton, Elaborated Thermochemical Treatment of HF, CO, N2, and H2O: Insight into HEAT and Its Extensions J. Chem. Phys. 155, 184109 (2021) [DOI: 10.1063/5.0069322]
7		T. L. Nguyen, D. H. Bross, B. Ruscic, G. B. Ellison, and J. F. Stanton, Mechanism, Thermochemistry, and Kinetics of the Reversible Reactions: C2H3 + H2 ⇌ C2H4 + H ⇌ C2H5. Faraday Discuss. , (Advance Article) (2022) [DOI: 10.1039/D1FD00124H]
8		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]
9		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 [8,9]).
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.