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].

Nitric acid

Formula: HON(O)O (g)

CAS RN: 7697-37-2

ATcT ID: 7697-37-2*0

SMILES: O[N+](=O)[O-]

InChI: InChI=1S/HNO3/c2-1(3)4/h(H,2,3,4)

InChIKey: GRYLNZFGIOXLOG-UHFFFAOYSA-N

SMILES: [H+].[N+](=O)([O-])[O-]

InChI: InChI=1S/NO3/c2-1(3)4/q-1/p+1

InChIKey: NHNBFGGVMKEFGY-UHFFFAOYSA-O

Hills Formula: H1N1O3

2D Image:

Aliases: HON(O)O; Nitric acid; Azotic acid; Fumic acid; Hydrogen nitrate; NSC 147791; NSC 15203; Nital; Nitryl hydroxide; Aqua fortis; UN 2032; HNO3; HONO2

Relative Molecular Mass: 63.01288 ± 0.00091

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
-124.46	-134.17	± 0.17	kJ/mol

3D Image of HON(O)O (g)

spin ON spin OFF

Top contributors to the provenance of Δ_fH° of HON(O)O (g)

The 20 contributors listed below account only for 86.0% of the provenance of Δ_fH° of HON(O)O (g).
A total of 34 contributors would be needed to account for 90% of the provenance.

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
27.6	1725.3	(NH4)NO3 (cr,l) → N2 (g) + 1/2 O2 (g) + 2 H2O (cr,l)	Δ_rH°(293.65 K) = -49.44 ± 0.06 kcal/mol	Becker 1934
23.1	2034.1	2 ONO (g) + 1/2 O2 (g) + H2O (g) → 2 HON(O)O (g)	Δ_rG°(371 K) = -6.04 ± 0.63 kJ/mol	Jones 1943, 3rd Law
9.1	2033.1	3 ONO (g) + H2O (g) → NO (g) + 2 HON(O)O (g)	Δ_rH°(293.1 K) = -8.95 ± 0.24 kcal/mol	Forsythe 1942, Chambers 1937, Wilson 1940, apud Gurvich TPIS
5.8	2033.4	3 ONO (g) + H2O (g) → NO (g) + 2 HON(O)O (g)	Δ_rG°(298.15 K) = 10.33 ± 1.08 (×1.164) kJ/mol	Chambers 1937, 3rd Law
3.1	2054.1	HON(O)O (cr,l) → HON(O)O (g)	Δ_rH°(293.15 K) = 9.426 ± 0.030 kcal/mol	Wilson 1940, est unc
2.3	2049.2	[ON(O)O]- (g) + HBr (g) → Br- (g) + HON(O)O (g)	Δ_rH°(391 K) = -1.03 ± 0.21 kcal/mol	Davidson 1977, 2nd Law
2.0	2033.3	3 ONO (g) + H2O (g) → NO (g) + 2 HON(O)O (g)	Δ_rH°(298.15 K) = -9.124 ± 0.5 kcal/mol	Forsythe 1942, Chambers 1937, est unc
2.0	2033.2	3 ONO (g) + H2O (g) → NO (g) + 2 HON(O)O (g)	Δ_rH°(298.15 K) = -9.184 ± 0.5 kcal/mol	Forsythe 1942, est unc
1.4	2086.1	2 NO (g) + 3/2 O2 (g) + H2O (cr,l) → 2 HON(O)O (aq)	Δ_rH°(298.15 K) = -74.05 ± 0.5 kcal/mol	Forsythe 1942, est unc
1.4	1483.2	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52400 ± 10 cm-1	Dingle 1975
1.4	1483.1	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52400 ± 10 cm-1	Callear 1970
1.1	2054.4	HON(O)O (cr,l) → HON(O)O (g)	Δ_rH°(298.15 K) = 9.33 ± 0.05 kcal/mol	NBS Tables 1989, est unc
1.0	1483.4	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52408 ± 10 (×1.164) cm-1	Kley 1973, Miescher 1974, est unc
0.8	2049.1	[ON(O)O]- (g) + HBr (g) → Br- (g) + HON(O)O (g)	Δ_rH°(0 K) = -0.045 ± 0.015 eV	Ferguson 1972b
0.6	2030.1	NH3 (g) + 3 H2O (g) → HON(O)O (g) + 4 H2 (g)	Δ_rH°(0 K) = 631.27 ± 2.0 kJ/mol	Klippenstein 2017
0.5	1640.6	O2NONO2 (g) + H2O (g) → 2 HON(O)O (g)	Δ_rH°(0 K) = -8.68 ± 0.9 kcal/mol	Ruscic W1RO
0.5	2033.6	3 ONO (g) + H2O (g) → NO (g) + 2 HON(O)O (g)	Δ_rG°(298.15 K) = 7.6 ± 1.2 (×3.364) kJ/mol	Abel 1930, 3rd Law, note unc5
0.5	2031.10	HON(O)O (g) → OH (g) + ONO (g)	Δ_rH°(0 K) = 198.51 ± 2.0 kJ/mol	Klippenstein 2017
0.4	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
0.4	1640.3	O2NONO2 (g) + H2O (g) → 2 HON(O)O (g)	Δ_rH°(0 K) = -7.50 ± 1.0 kcal/mol	Ruscic G4

Top 10 species with enthalpies of formation correlated to the Δ_fH° of HON(O)O (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
84.4	Nitric acid	HON(O)O (cr,l)	-178.99	-173.26	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*500
83.4	Nitric acid	HON(O)O (aq, 1000 H2O)		-206.23	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*839
83.4	Nitric acid	HON(O)O (aq, 3 H2O)		-197.76	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*805
83.4	Nitric acid	HON(O)O (aq, 25 H2O)		-206.01	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*819
83.4	Nitric acid	HON(O)O (aq, 1 H2O)		-186.82	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*801
83.4	Nitrate	[ON(O)O]- (aq)		-206.55	± 0.18	kJ/mol	62.00549 ± 0.00090	14797-55-8*800
83.4	Nitric acid	HON(O)O (aq)		-206.55	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*800
83.4	Nitric acid	HON(O)O (aq, 4 H2O)		-200.30	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*807
83.4	Nitric acid	HON(O)O (aq, 2 H2O)		-193.75	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*803
83.4	Nitric acid	HON(O)O (aq, 7 H2O)		-203.79	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*812

Most Influential reactions involving HON(O)O (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
0.770	7545.2	CH3OH (g) + 2 ONO (g) → HON(O)O (g) + CH3ONO (g)	Δ_rG°(393.95 K) = -0.865 ± 0.105 kcal/mol	Silverwood 1967, 3rd Law
0.582	2054.1	HON(O)O (cr,l) → HON(O)O (g)	Δ_rH°(293.15 K) = 9.426 ± 0.030 kcal/mol	Wilson 1940, est unc
0.479	2026.1	HON(O)O (g) → [HON(O)O]+ (g)	Δ_rH°(0 K) = 11.95 ± 0.01 eV	Lloyd 1975, Ames 1976
0.479	2026.2	HON(O)O (g) → [HON(O)O]+ (g)	Δ_rH°(0 K) = 11.96 ± 0.01 eV	Frost 1975
0.271	2034.1	2 ONO (g) + 1/2 O2 (g) + H2O (g) → 2 HON(O)O (g)	Δ_rG°(371 K) = -6.04 ± 0.63 kJ/mol	Jones 1943, 3rd Law
0.245	2027.7	[HON(O)O]- (g) → HON(O)O (g)	Δ_rH°(0 K) = 0.707 ± 0.050 eV	Ruscic W1RO
0.209	2054.4	HON(O)O (cr,l) → HON(O)O (g)	Δ_rH°(298.15 K) = 9.33 ± 0.05 kcal/mol	NBS Tables 1989, est unc
0.165	2027.5	[HON(O)O]- (g) → HON(O)O (g)	Δ_rH°(0 K) = 0.733 ± 0.061 eV	Ruscic G4
0.106	2033.1	3 ONO (g) + H2O (g) → NO (g) + 2 HON(O)O (g)	Δ_rH°(293.1 K) = -8.95 ± 0.24 kcal/mol	Forsythe 1942, Chambers 1937, Wilson 1940, apud Gurvich TPIS
0.096	2049.2	[ON(O)O]- (g) + HBr (g) → Br- (g) + HON(O)O (g)	Δ_rH°(391 K) = -1.03 ± 0.21 kcal/mol	Davidson 1977, 2nd Law
0.085	2027.4	[HON(O)O]- (g) → HON(O)O (g)	Δ_rH°(0 K) = 0.684 ± 0.085 eV	Ruscic G3X
0.072	2027.6	[HON(O)O]- (g) → HON(O)O (g)	Δ_rH°(0 K) = 0.678 ± 0.092 eV	Ruscic CBS-n
0.068	2033.4	3 ONO (g) + H2O (g) → NO (g) + 2 HON(O)O (g)	Δ_rG°(298.15 K) = 10.33 ± 1.08 (×1.164) kJ/mol	Chambers 1937, 3rd Law
0.060	7545.1	CH3OH (g) + 2 ONO (g) → HON(O)O (g) + CH3ONO (g)	Δ_rH°(393.95 K) = -15.808 ± 0.376 kcal/mol	Silverwood 1967, 2nd Law
0.052	2054.3	HON(O)O (cr,l) → HON(O)O (g)	Δ_rH°(293.15 K) = 9.350 ± 0.100 kcal/mol	Forsythe 1942, Wilson 1940
0.052	2054.2	HON(O)O (cr,l) → HON(O)O (g)	Δ_rH°(293.15 K) = 9.450 ± 0.100 kcal/mol	Wilson 1940, Forsythe 1942
0.035	2049.1	[ON(O)O]- (g) + HBr (g) → Br- (g) + HON(O)O (g)	Δ_rH°(0 K) = -0.045 ± 0.015 eV	Ferguson 1972b
0.027	2027.1	[HON(O)O]- (g) → HON(O)O (g)	Δ_rH°(298.15 K) = 0.57 ± 0.15 eV	Mathur 1976
0.024	2037.1	(NH4)NO3 (cr,l) → NH3 (g) + HON(O)O (g)	Δ_rG°(493 K) = 38.6 ± 0.7 kJ/mol	Feick 1954, 3rd Law
0.024	2033.2	3 ONO (g) + H2O (g) → NO (g) + 2 HON(O)O (g)	Δ_rH°(298.15 K) = -9.184 ± 0.5 kcal/mol	Forsythe 1942, 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. 1.176 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.