Selected ATcT [1, 2] enthalpy of formation based on version 1.122 of the Thermochemical Network [3]

This version of ATcT results was partially described in Ruscic et al. [4], and was also used for the initial development of high-accuracy ANLn composite electronic structure methods [5].

Species Name Formula Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Molecular
Mass		 ATcT ID
Hydrazoic acidHNNN (aq, undissoc)N=[N+]=[N-]257.63± 0.48kJ/mol43.02816 ±
0.00022		7782-79-8*1000

Top contributors to the provenance of ΔfH° of HNNN (aq, undissoc)

The 20 contributors listed below account only for 84.8% of the provenance of ΔfH° of HNNN (aq, undissoc).
A total of 37 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
25.91502.1 2 [NNN]- (aq) + [I3]- (aq) → 3 N2 (g) + 3 I- (aq) ΔrH°(298.15 K) = -158.78 ± 0.2 kcal/molGray 1956
17.6892.1 I2 (cr,l) + I- (aq) → [I3]- (aq) ΔrH°(298.15 K) = 1.338 ± 0.256 kcal/molWu 1963
9.81481.11 HNNN (g) → H (g) + 3 N (g) ΔrH°(0 K) = 318.06 ± 0.30 kcal/molKarton 2011
8.4891.1 Br2 (cr,l) + 3 I- (aq) → [I3]- (aq) + 2 Br- (aq) ΔrH°(298.15 K) = -29.355 ± 0.364 kcal/molWu 1963
3.41499.1 HNNN (g) → HNNN (aq, undissoc) ΔrH°(298.15 K) = -8.1 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
3.41499.2 HNNN (g) → HNNN (aq, undissoc) ΔrG°(298.15 K) = -1.5 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
2.81481.10 HNNN (g) → H (g) + 3 N (g) ΔrH°(0 K) = 317.83 ± 0.56 kcal/molKarton 2011
2.71488.1 HNNN (g) → 1/2 H2 (g) + 3/2 N2 (g) ΔrH°(285.6 K) = -70.3 ± 0.5 (×1.139) kcal/molGunther 1935, as quoted by Gurvich TPIS, as quoted by NBS Tables
2.51489.1 HNNN (g) → H (g) + NNN (g) ΔrH°(0 K) = 30970 ± 50 cm-1Cook 1999
2.11500.2 HNNN (aq, undissoc) → HNNN (aq) ΔrH°(298.15 K) = 3.60 ± 0.05 kcal/molGray 1956
1.0893.2 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
0.61489.2 HNNN (g) → H (g) + NNN (g) ΔrH°(0 K) = 30920 ± 100 cm-1Yuan 2008
0.61481.12 HNNN (g) → H (g) + 3 N (g) ΔrH°(0 K) = 316.66 ± 1 (×1.189) kcal/molGutowski 2006
0.51500.4 HNNN (aq, undissoc) → HNNN (aq) ΔrG°(298.15 K) = 6.3 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
0.51500.5 HNNN (aq, undissoc) → HNNN (aq) ΔrG°(298.15 K) = 6.2 ± 0.1 kcal/molQuintin 1940, Gray 1956
0.51500.1 HNNN (aq, undissoc) → HNNN (aq) ΔrH°(298.15 K) = 3.6 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
0.5950.11 NNN (g) → N2 (g) + N (g) ΔrH°(0 K) = 4.00 ± 1.0 kcal/molDixon 2004
0.5945.9 NNN (g) → 3 N (g) ΔrH°(0 K) = 228.34 ± 1.0 kcal/molDixon 2004
0.41481.9 HNNN (g) → H (g) + 3 N (g) ΔrH°(0 K) = 317.09 ± 1.35 kcal/molKarton 2011
0.4890.1 HI (g) → HI (aq) ΔrH°(298.15 K) = -19.905 ± 0.020 kcal/molVanderzee 1974

Top 10 species with enthalpies of formation correlated to the ΔfH° of HNNN (aq, undissoc)

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
94.5 Hydrazoic acidHNNN (aq)N=[N+]=[N-]272.61± 0.47kJ/mol43.02816 ±
0.00022		7782-79-8*800
94.5 Azide ion[NNN]- (aq)[N]N=[N-]272.61± 0.47kJ/mol42.02077 ±
0.00021		14343-69-2*800
82.6 Hydrazoic acidHNNN (g)N=[N+]=[N-]297.92291.62± 0.48kJ/mol43.02816 ±
0.00022		7782-79-8*0
62.3 Hydrazoic acidHNNN (cr,l)N=[N+]=[N-]261.50± 0.64kJ/mol43.02816 ±
0.00022		7782-79-8*500
51.9 Azido radicalNNN (g)[N]N=[N]452.24449.65± 0.58kJ/mol42.02022 ±
0.00021		12596-60-0*0
46.1 Hydrazoic acid cation[HNNN]+ (g)N=[N+]=[N]1333.771328.10± 0.82kJ/mol43.02761 ±
0.00022		58852-14-5*0
28.9 Trinitrogen cation[NNN]+ (g)[N]N=[N+]1519.391516.86± 0.87kJ/mol42.01967 ±
0.00021		12185-03-4*0
27.7 Azide ion[NNN]- (g)[N]N=[N-]193.63190.05± 0.89kJ/mol42.02077 ±
0.00021		14343-69-2*0
17.2 Hydrazoic acid anion[HNNN]- (g, cis)N=[N]=[N-]316.2310.0± 2.3kJ/mol43.02871 ±
0.00022		203264-98-6*2
-56.0 Triiodide ion[I3]- (aq)I[I-]I-51.36± 0.80kJ/mol380.713959 ±
0.000090		14900-04-0*800

Most Influential reactions involving HNNN (aq, undissoc)

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
0.5561500.2 HNNN (aq, undissoc) → HNNN (aq) ΔrH°(298.15 K) = 3.60 ± 0.05 kcal/molGray 1956
0.4521499.1 HNNN (g) → HNNN (aq, undissoc) ΔrH°(298.15 K) = -8.1 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
0.4521499.2 HNNN (g) → HNNN (aq, undissoc) ΔrG°(298.15 K) = -1.5 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
0.1391500.4 HNNN (aq, undissoc) → HNNN (aq) ΔrG°(298.15 K) = 6.3 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
0.1391500.5 HNNN (aq, undissoc) → HNNN (aq) ΔrG°(298.15 K) = 6.2 ± 0.1 kcal/molQuintin 1940, Gray 1956
0.1391500.1 HNNN (aq, undissoc) → HNNN (aq) ΔrH°(298.15 K) = 3.6 ± 0.1 kcal/molD'Orazio 1963, as quoted by NBS Tables
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. 1.122 of the Thermochemical Network (2016); available at ATcT.anl.gov
4   B. Ruscic,
Active Thermochemical Tables: Sequential Bond Dissociation Enthalpies of Methane, Ethane, and Methanol and the Related Thermochemistry.
J. Phys. Chem. A 119, 7810-7837 (2015) [DOI: 10.1021/acs.jpca.5b01346]
5   S. J. Klippenstein, L. B. Harding, and B. Ruscic,
Ab initio Computations and Active Thermochemical Tables Hand in Hand: Heats of Formation of Core Combustion Species.
J. Phys. Chem. A 121, 6580-6602 (2017) [DOI: 10.1021/acs.jpca.7b05945]
6   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]
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 [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.