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].

Hydrazoic acid

Formula: HNNN (g)
CAS RN: 7782-79-8
ATcT ID: 7782-79-8*0
SMILES: N=[N+]=[N-]
InChI: InChI=1S/HN3/c1-3-2/h1H
InChIKey: JUINSXZKUKVTMD-UHFFFAOYSA-N
Hills Formula: H1N3

2D Image:

N=[N+]=[N-]
Aliases: HNNN; Hydrazoic acid; Hydrogen azide; Azidic acid; Azoimide; Diazoimide; Hydronitric acid; Triazoic acid; NNNH
Relative Molecular Mass: 43.02816 ± 0.00022

   ΔfH°(0 K)   ΔfH°(298.15 K)UncertaintyUnits
297.99291.69± 0.48kJ/mol

3D Image of HNNN (g)

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Top contributors to the provenance of ΔfH° of HNNN (g)

The 20 contributors listed below account only for 80.8% of the provenance of ΔfH° of HNNN (g).
A total of 43 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
17.72133.1 [NNN]- (aq) [I3]- (aq) → 3 N2 (g) + 3 I- (aq) ΔrH°(298.15 K) = -158.78 ± 0.2 kcal/molGray 1956
14.42112.11 HNNN (g) → H (g) + 3 N (g) ΔrH°(0 K) = 318.06 ± 0.30 kcal/molKarton 2011
11.91357.1 I2 (cr,l) I- (aq) → [I3]- (aq) ΔrH°(298.15 K) = 1.338 ± 0.256 kcal/molWu 1963
5.91356.1 Br2 (cr,l) + 3 I- (aq) → [I3]- (aq) + 2 Br- (aq) ΔrH°(298.15 K) = -29.355 ± 0.364 kcal/molWu 1963
4.42130.2 HNNN (g) → HNNN (aq, undissoc) ΔrG°(298.15 K) = -1.5 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
4.42130.1 HNNN (g) → HNNN (aq, undissoc) ΔrH°(298.15 K) = -8.1 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
4.42119.1 HNNN (g) → 1/2 H2 (g) + 3/2 N2 (g) ΔrH°(285.6 K) = -70.3 ± 0.5 (×1.091) kcal/molGunther 1935, apud Gurvich TPIS, as quoted by NBS Tables
4.12112.10 HNNN (g) → H (g) + 3 N (g) ΔrH°(0 K) = 317.83 ± 0.56 kcal/molKarton 2011
3.12120.1 HNNN (g) → H (g) NNN (g) ΔrH°(0 K) = 30970 ± 50 cm-1Cook 1999
2.52112.13 HNNN (g) → H (g) + 3 N (g) ΔrH°(0 K) = 1330.1 ± 3.0 kJ/molKlopper 2010a
1.42131.2 HNNN (aq, undissoc) → HNNN (aq) ΔrH°(298.15 K) = 3.60 ± 0.05 kcal/molGray 1956
0.92112.12 HNNN (g) → H (g) + 3 N (g) ΔrH°(0 K) = 316.66 ± 1 (×1.189) kcal/molGutowski 2006
0.71445.11 NNN (g) → N2 (g) N (g) ΔrH°(0 K) = 4.00 ± 1.0 kcal/molDixon 2004
0.71440.9 NNN (g) → 3 N (g) ΔrH°(0 K) = 228.34 ± 1.0 kcal/molDixon 2004
0.72120.2 HNNN (g) → H (g) NNN (g) ΔrH°(0 K) = 30920 ± 100 cm-1Yuan 2008
0.72112.9 HNNN (g) → H (g) + 3 N (g) ΔrH°(0 K) = 317.09 ± 1.35 kcal/molKarton 2011
0.61358.1 Cl2 (g) + 3 I- (aq) → 2 Cl- (aq) [I3]- (aq) ΔrH°(298.15 K) = -51.5 ± 1.1 kcal/molWartenberg 1930, Wartenberg 1931, Parker 1965
0.52112.8 HNNN (g) → H (g) + 3 N (g) ΔrH°(0 K) = 317.66 ± 1.50 kcal/molRuscic W1RO
0.51446.4 NNN (g) CO (g) [O2]+ (g) → [CO2]+ (g) N2 (g) NO (g) ΔrH°(0 K) = -114.03 ± 1.2 kcal/molRuscic W1RO
0.51444.9 [NNN]- (g) → 3 N (g) ΔrH°(0 K) = 290.18 ± 1.0 kcal/molDixon 2004

Top 10 species with enthalpies of formation correlated to the ΔfH° of HNNN (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 Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Molecular
Mass
ATcT ID
82.6 Hydrazoic acidHNNN (aq, undissoc)N=[N+]=[N-]257.70± 0.48kJ/mol43.02816 ±
0.00022
7782-79-8*1000
78.0 Hydrazoic acidHNNN (aq)N=[N+]=[N-]272.69± 0.47kJ/mol43.02816 ±
0.00022
7782-79-8*800
78.0 Azide[NNN]- (aq)[N]N=[N-]272.69± 0.47kJ/mol42.02077 ±
0.00021
14343-69-2*800
75.3 Hydrazoic acidHNNN (cr,l)N=[N+]=[N-]261.57± 0.64kJ/mol43.02816 ±
0.00022
7782-79-8*500
63.7 Azido radicalNNN (g)[N]N=[N]452.38449.79± 0.59kJ/mol42.02022 ±
0.00021
12596-60-0*0
55.7 Hydrazoic acid cation[HNNN]+ (g)N=[N+]=[N]1333.731328.06± 0.82kJ/mol43.02761 ±
0.00022
58852-14-5*0
35.6 Trinitrogen cation[NNN]+ (g)[N]N=[N+]1519.591516.96± 0.89kJ/mol42.01967 ±
0.00021
12185-03-4*0
34.2 Azide[NNN]- (g)[N]N=[N-]193.63190.13± 0.91kJ/mol42.02077 ±
0.00021
14343-69-2*0
24.3 Cyanic azideNCNNN (g)N#CN=[N+]=[N-]502.8498.3± 1.9kJ/mol68.03766 ±
0.00085
764-05-6*0
-46.1 Triiodide[I3]- (aq)I[I-]I-51.53± 0.79kJ/mol380.713959 ±
0.000090
14900-04-0*800

Most Influential reactions involving HNNN (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
1.0002129.1 HNNN (cr,l) → HNNN (g) ΔrH°(298.15 K) = 7.2 ± 0.1 kcal/molGunther 1935, as quoted by NBS Tables
0.6042120.1 HNNN (g) → H (g) NNN (g) ΔrH°(0 K) = 30970 ± 50 cm-1Cook 1999
0.4992113.2 HNNN (g) → [HNNN]+ (g) ΔrH°(0 K) = 10.740 ± 0.010 eVEland 1970, note unc2
0.4522130.1 HNNN (g) → HNNN (aq, undissoc) ΔrH°(298.15 K) = -8.1 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
0.4522130.2 HNNN (g) → HNNN (aq, undissoc) ΔrG°(298.15 K) = -1.5 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
0.2402128.5 HN(NN) (g) → HNNN (g) ΔrH°(0 K) = -39.59 ± 1.2 kcal/molRuscic W1RO
0.2172115.5 [HNNN]- (g, cis) → HNNN (g) ΔrH°(0 K) = -0.183 ± 0.050 eVRuscic W1RO
0.2172114.5 [HNNN]- (g, trans) → HNNN (g) ΔrH°(0 K) = -0.111 ± 0.050 eVRuscic W1RO
0.2042128.2 HN(NN) (g) → HNNN (g) ΔrH°(0 K) = -39.40 ± 1.3 kcal/molRuscic G4
0.2042128.4 HN(NN) (g) → HNNN (g) ΔrH°(0 K) = -40.81 ± 1.3 kcal/molRuscic CBS-n
0.1798422.6 NCNNN (g) H2 (g) → HNNN (g) HCN (g) ΔrH°(0 K) = -18.3 ± 1.0 kcal/molPfeifle 2017, est unc
0.1762128.1 HN(NN) (g) → HNNN (g) ΔrH°(0 K) = -39.90 ± 1.4 kcal/molRuscic G3X
0.1512120.2 HNNN (g) → H (g) NNN (g) ΔrH°(0 K) = 30920 ± 100 cm-1Yuan 2008
0.1462112.11 HNNN (g) → H (g) + 3 N (g) ΔrH°(0 K) = 318.06 ± 0.30 kcal/molKarton 2011
0.1462115.2 [HNNN]- (g, cis) → HNNN (g) ΔrH°(0 K) = -0.180 ± 0.061 eVRuscic G4
0.1462114.2 [HNNN]- (g, trans) → HNNN (g) ΔrH°(0 K) = -0.111 ± 0.061 eVRuscic G4
0.1352128.3 HN(NN) (g) → HNNN (g) ΔrH°(0 K) = -38.87 ± 1.6 kcal/molRuscic CBS-n
0.1242113.5 HNNN (g) → [HNNN]+ (g) ΔrH°(0 K) = 10.74 ± 0.02 eVBastide 1976
0.1242113.1 HNNN (g) → [HNNN]+ (g) ΔrH°(0 K) = 10.72 ± 0.02 eVCvitas 1976, est unc
0.1242113.3 HNNN (g) → [HNNN]+ (g) ΔrH°(0 K) = 10.72 ± 0.02 eVCradock 1972


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 21st 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.