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].

Dinitrogen pentoxide

Formula: O2NONO2 (g)

CAS RN: 10102-03-1

ATcT ID: 10102-03-1*0

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

InChI: InChI=1S/N2O5/c3-1(4)7-2(5)6

InChIKey: ZWWCURLKEXEFQT-UHFFFAOYSA-N

Hills Formula: N2O5

2D Image:

Aliases: O2NONO2; Dinitrogen pentoxide; 1,3-Dioxodiazoxane 1,3-dioxide; 1,3-Dioxodiazoxane-1,3-dioxide; Nitril nitrate; mu-oxido-bis(dioxidonitrogen)dinitrooxidane; N2O5

Relative Molecular Mass: 108.0105 ± 0.0015

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
24.32	14.74	± 0.29	kJ/mol

3D Image of O2NONO2 (g)

spin ON spin OFF

Top contributors to the provenance of Δ_fH° of O2NONO2 (g)

The 20 contributors listed below account only for 86.6% of the provenance of Δ_fH° of O2NONO2 (g).
A total of 26 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
29.0	2047.1	ON(O)O (g) → O (g) + ONO (g)	Δ_rH°(0 K) = 17079 ± 15 cm-1	Johnston 1996, Davis 1993
18.5	1636.1	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(298.15 K) = 12.180 ± 0.076 kcal/mol	Osthoff 2007, note unc2
4.2	1483.1	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52400 ± 10 cm-1	Callear 1970
4.2	1483.2	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52400 ± 10 cm-1	Dingle 1975
3.7	1638.6	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(294.8 K) = 12.23 ± 0.17 kcal/mol	Matsumoto 2006, 3rd Law
3.4	1639.1	O2NONO2 (g) → ONO (g) + NO (g) + O2 (g)	Δ_rG°(298.15 K) = 4.77 ± 0.30 kcal/mol	Ray 1957a, Daniels 1921, 3rd Law, apud Gurvich TPIS
3.1	1483.4	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52408 ± 10 (×1.164) cm-1	Kley 1973, Miescher 1974, est unc
2.6	1636.2	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(298.15 K) = 12.22 ± 0.20 kcal/mol	Hjorth 1992, 3rd Law, note unc2
2.6	1638.8	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(295 K) = 12.25 ± 0.20 kcal/mol	Matsumoto 2006, 3rd Law
2.6	1638.9	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(293 K) = 12.49 ± 0.20 kcal/mol	Matsumoto 2006, 3rd Law
1.7	1638.10	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(295 K) = 12.19 ± 0.25 kcal/mol	Matsumoto 2006, 3rd Law
1.2	1637.7	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(295 K) = 12.02 ± 0.29 kcal/mol	Burrows 1985, 3rd Law, note unc5
1.1	1638.4	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(298.15 K) = 12.17 ± 0.30 kcal/mol	Tuazon 1984, note unc5
1.1	1637.5	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(297 K) = 12.17 ± 0.30 kcal/mol	Kircher 1984, 3rd Law, note unc5
1.1	1638.1	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(300 K) = 12.0 ± 0.3 kcal/mol	Perner 1985, note unc5
1.1	1638.2	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(298.15 K) = 12.3 ± 0.3 kcal/mol	Smith 1985, Viggiano 1981, note unc5
1.1	1638.3	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(298.15 K) = 11.9 ± 0.3 kcal/mol	Smith 1985, Connell 1979, note unc5
1.1	1637.3	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(313.5 K) = 11.37 ± 0.31 kcal/mol	Graham 1978, Graham 1975, 3rd Law, note unc5
1.1	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
1.0	1637.9	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(320 K) = 11.59 ± 0.32 kcal/mol	Cantrell 1988, 3rd Law, note unc5

Top 10 species with enthalpies of formation correlated to the Δ_fH° of O2NONO2 (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
77.1	Dinitrogen pentoxide	O2NONO2 (cr,l)		-41.15	± 0.38	kJ/mol	108.0105 ± 0.0015	10102-03-1*500
68.4	Nitroxyl	ON(O)O (g)	79.38	74.12	± 0.19	kJ/mol	62.00494 ± 0.00090	12033-49-7*0
54.9	Nitrate	[ON(O)O]- (g)	-299.73	-306.28	± 0.22	kJ/mol	62.00549 ± 0.00090	14797-55-8*0
43.2	Nitrogen dioxide	ONO (g)	36.866	34.059	± 0.064	kJ/mol	46.00554 ± 0.00060	10102-44-0*0
43.2	Nitric oxide	NO (g)	90.627	91.131	± 0.064	kJ/mol	30.00614 ± 0.00031	10102-43-9*0
43.1	Nitrosyl ion	[NO]+ (g)	984.494	984.489	± 0.064	kJ/mol	30.00559 ± 0.00031	14452-93-8*0
42.0	Dinitrogen tetraoxide	O2NNO2 (g)	20.17	10.88	± 0.14	kJ/mol	92.0111 ± 0.0012	10544-72-6*0
41.7	Nitrosyl chloride	ClNO (g)	54.461	52.559	± 0.067	kJ/mol	65.45884 ± 0.00095	2696-92-6*0
40.7	Dioxohydrazine	ONNO (g, cis)	172.91	171.14	± 0.14	kJ/mol	60.01228 ± 0.00062	16824-89-8*2
40.7	Dioxohydrazine	ONNO (g)	172.91	171.14	± 0.14	kJ/mol	60.01228 ± 0.00062	16824-89-8*0

Most Influential reactions involving O2NONO2 (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
0.896	1641.2	O2NONO2 (cr,l) → O2NONO2 (g)	Δ_rH°(298.15 K) = 13.37 ± 0.06 kcal/mol	Russ 1913, apud JANAF 3
0.402	1636.1	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(298.15 K) = 12.180 ± 0.076 kcal/mol	Osthoff 2007, note unc2
0.080	1638.6	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(294.8 K) = 12.23 ± 0.17 kcal/mol	Matsumoto 2006, 3rd Law
0.058	1638.9	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(293 K) = 12.49 ± 0.20 kcal/mol	Matsumoto 2006, 3rd Law
0.058	1636.2	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(298.15 K) = 12.22 ± 0.20 kcal/mol	Hjorth 1992, 3rd Law, note unc2
0.058	1638.8	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(295 K) = 12.25 ± 0.20 kcal/mol	Matsumoto 2006, 3rd Law
0.056	1641.6	O2NONO2 (cr,l) → O2NONO2 (g)	Δ_rH°(298.15 K) = 13.12 ± 0.24 kcal/mol	Russ 1913, Daniels 1920, apud Gurvich TPIS
0.043	1639.1	O2NONO2 (g) → ONO (g) + NO (g) + O2 (g)	Δ_rG°(298.15 K) = 4.77 ± 0.30 kcal/mol	Ray 1957a, Daniels 1921, 3rd Law, apud Gurvich TPIS
0.037	1638.10	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(295 K) = 12.19 ± 0.25 kcal/mol	Matsumoto 2006, 3rd Law
0.030	1641.3	O2NONO2 (cr,l) → O2NONO2 (g)	Δ_rH°(298.15 K) = 13.04 ± 0.12 (×2.709) kcal/mol	Russ 1913, 2nd Law, note unc6
0.027	1637.7	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(295 K) = 12.02 ± 0.29 kcal/mol	Burrows 1985, 3rd Law, note unc5
0.025	1638.2	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(298.15 K) = 12.3 ± 0.3 kcal/mol	Smith 1985, Viggiano 1981, note unc5
0.025	1638.1	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(300 K) = 12.0 ± 0.3 kcal/mol	Perner 1985, note unc5
0.025	1638.3	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(298.15 K) = 11.9 ± 0.3 kcal/mol	Smith 1985, Connell 1979, note unc5
0.025	1637.5	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(297 K) = 12.17 ± 0.30 kcal/mol	Kircher 1984, 3rd Law, note unc5
0.025	1638.4	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(298.15 K) = 12.17 ± 0.30 kcal/mol	Tuazon 1984, note unc5
0.024	1637.3	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(313.5 K) = 11.37 ± 0.31 kcal/mol	Graham 1978, Graham 1975, 3rd Law, note unc5
0.022	1637.9	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(320 K) = 11.59 ± 0.32 kcal/mol	Cantrell 1988, 3rd Law, note unc5
0.011	1640.6	O2NONO2 (g) + H2O (g) → 2 HON(O)O (g)	Δ_rH°(0 K) = -8.68 ± 0.9 kcal/mol	Ruscic W1RO
0.011	1638.7	O2NONO2 (g) → ONO (g) + ON(O)O (g)	Δ_rG°(295.6 K) = 12.69 ± 0.17 (×2.65) kcal/mol	Matsumoto 2006, 3rd Law

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. 1.172 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.