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

This version of ATcT results was generated from an expansion of version 1.122e [4] to include results centered on the determination of the appearance energy of CH3+ from CH4. [5].

Species Name Formula Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Molecular
Mass
ATcT ID
Hydrogen iodideHI (g)I28.64526.470± 0.036kJ/mol127.912410 ±
0.000076
10034-85-2*0

Representative Geometry of HI (g)

spin ON           spin OFF
          

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

The 9 contributors listed below account for 98.0% of the provenance of ΔfH° of HI (g).

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
78.51087.1 HI (g) → H2 (g) I2 (g) ΔrG°(721.5 K) = 23.625 ± 0.080 kJ/molTaylor 1941, 3rd Law
11.41088.1 HI (g) → 1/2 H2 (g) + 1/2 I2 (g) ΔrG°(704 K) = 11.571 ± 0.028 (×3.748) kJ/molRittenberg 1934, note HI, 3rd Law
6.31087.2 HI (g) → H2 (g) I2 (g) ΔrH°(721.5 K) = 12.583 ± 0.282 kJ/molTaylor 1941, 2nd Law
0.41088.3 HI (g) → 1/2 H2 (g) + 1/2 I2 (g) ΔrG°(644.4 K) = 11.143 ± 0.515 kJ/molBodenstein 1894, 3rd Law
0.41088.5 HI (g) → 1/2 H2 (g) + 1/2 I2 (g) ΔrG°(735 K) = 11.718 ± 0.545 kJ/molBright 1947, note HI, 3rd Law
0.22670.4 CH3CHCH2 (g) + 2 HI (g) → CH3CH2CH3 (g) I2 (g) ΔrG°(597 K) = -5.79 ± 0.20 (×1.682) kcal/molNangia 1964, Nangia 1964a, 3rd Law, est unc
0.21088.4 HI (g) → 1/2 H2 (g) + 1/2 I2 (g) ΔrH°(644.4 K) = 6.343 ± 0.745 kJ/molBodenstein 1894, 2nd Law
0.11086.3 HI (g) → H (g) I (g) ΔrH°(0 K) = 70.33 ± 0.2 kcal/molFeller 2008
0.11091.1 HI (g) Cl (g) → HCl (g) I (g) ΔrH°(0 K) = -31.82 ± 0.2 kcal/molFeller 2008

Top 10 species with enthalpies of formation correlated to the ΔfH° of HI (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
39.3 Hydrogen iodideHI (aq)I-56.826± 0.090kJ/mol127.912410 ±
0.000076
10034-85-2*800
39.3 IodideI- (aq)[I-]-56.826± 0.090kJ/mol126.905019 ±
0.000030
20461-54-5*800
8.6 Triiodide[I3]- (aq)I[I-]I-51.25± 0.80kJ/mol380.713959 ±
0.000090
14900-04-0*800
5.4 Iodine atomI (g)[I]107.157106.757± 0.0021kJ/mol126.904470 ±
0.000030
14362-44-8*0
5.4 Iodine atomI (g, 2P1/2)[I]198.109197.709± 0.0021kJ/mol126.904470 ±
0.000030
14362-44-8*2
5.4 Iodine atomI (g, 2P3/2)[I]107.157106.757± 0.0021kJ/mol126.904470 ±
0.000030
14362-44-8*1
5.4 DiiodineI2 (g)II65.49762.417± 0.0041kJ/mol253.808940 ±
0.000060
7553-56-2*0
4.9 IodideI- (g)[I-]-187.995-188.396± 0.0021kJ/mol126.905019 ±
0.000030
20461-54-5*0
3.0 Azide[NNN]- (aq)[N]N=[N-]272.56± 0.48kJ/mol42.02077 ±
0.00021
14343-69-2*800
3.0 Hydrazoic acidHNNN (aq)N=[N+]=[N-]272.56± 0.48kJ/mol43.02816 ±
0.00022
7782-79-8*800

Most Influential reactions involving HI (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
0.9611093.1 HI (g) → HI (aq) ΔrH°(298.15 K) = -19.905 ± 0.020 kcal/molVanderzee 1974
0.7881087.1 HI (g) → H2 (g) I2 (g) ΔrG°(721.5 K) = 23.625 ± 0.080 kJ/molTaylor 1941, 3rd Law
0.1564418.1 CHF3 (g) I2 (g) → CF3I (g) HI (g) ΔrH°(298.15 K) = 17.10 ± 0.34 kcal/molGoy 1967, as quoted by Cox 1970
0.1141088.1 HI (g) → 1/2 H2 (g) + 1/2 I2 (g) ΔrG°(704 K) = 11.571 ± 0.028 (×3.748) kJ/molRittenberg 1934, note HI, 3rd Law
0.0974322.2 CI4 (g) + 4 HCl (g) → CCl4 (g) + 4 HI (g) ΔrH°(0 K) = 14.17 ± 3.1 kcal/molRuscic unpub
0.0974320.2 CI4 (g) + 4 H2 (g) → CH4 (g) + 4 HI (g) ΔrH°(0 K) = -70.42 ± 3.1 kcal/molRuscic unpub
0.0914322.3 CI4 (g) + 4 HCl (g) → CCl4 (g) + 4 HI (g) ΔrH°(0 K) = 14.75 ± 3.2 kcal/molRuscic unpub
0.0914320.3 CI4 (g) + 4 H2 (g) → CH4 (g) + 4 HI (g) ΔrH°(0 K) = -70.03 ± 3.2 kcal/molRuscic unpub
0.0631087.2 HI (g) → H2 (g) I2 (g) ΔrH°(721.5 K) = 12.583 ± 0.282 kJ/molTaylor 1941, 2nd Law
0.0551136.2 HOI (g) H2 (g) → H2O (g) HI (g) ΔrH°(0 K) = -37.92 ± 3.1 kcal/molRuscic unpub
0.0521136.3 HOI (g) H2 (g) → H2O (g) HI (g) ΔrH°(0 K) = -37.80 ± 3.2 kcal/molRuscic unpub
0.0461136.1 HOI (g) H2 (g) → H2O (g) HI (g) ΔrH°(0 K) = -36.97 ± 3.4 kcal/molRuscic unpub
0.0434384.4 CH3I (g) HI (g) → I2 (g) CH4 (g) ΔrG°(669 K) = -10.34 ± 0.09 (×2.134) kcal/molGoy 1965, 3rd Law
0.0404384.2 CH3I (g) HI (g) → I2 (g) CH4 (g) ΔrG°(630.5 K) = -10.48 ± 0.08 (×2.484) kcal/molGolden 1965, 3rd Law, Cox 1970
0.0271090.1 HI (g) Br (g) → HBr (g) I (g) ΔrH°(0 K) = -16.14 ± 0.2 kcal/molFeller 2008
0.0261093.2 HI (g) → HI (aq) ΔrG°(298.15 K) = -53.93 ± 0.50 kJ/molBates 1919, as quoted by CODATA Key Vals
0.0162377.2 ICN (g) HBr (g) → BrCN (g) HI (g) ΔrH°(0 K) = 5.21 ± 3.1 kcal/molRuscic unpub
0.0162635.1 CH3CH2CH2 (g) HI (g) → CH3CH2CH3 (g) I (g) ΔrG°(560 K) = -99.1 ± 4.2 kJ/molLeplat 2014a, Knox 1967, 3rd Law, note unc2
0.0152377.3 ICN (g) HBr (g) → BrCN (g) HI (g) ΔrH°(0 K) = 5.20 ± 3.2 kcal/molRuscic unpub
0.0152670.4 CH3CHCH2 (g) + 2 HI (g) → CH3CH2CH3 (g) I2 (g) ΔrG°(597 K) = -5.79 ± 0.20 (×1.682) kcal/molNangia 1964, Nangia 1964a, 3rd Law, est unc


References (for your convenience, also available in RIS and BibTex format)
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. 1.122g of the Thermochemical Network (2019); available at ATcT.anl.gov
4   J. P. Porterfield, D. H. Bross, B. Ruscic, J. H. Thorpe, T. L. Nguyen, J. H. Baraban, J. F. Stanton, J. W. Daily, and G. B. Ellison,
Thermal Decomposition of Potential Ester Biofuels, Part I: Methyl Acetate and Methyl Butanoate.
J. Chem. Phys. A 121, 4658-4677 (2017) [DOI: 10.1021/acs.jpca.7b02639] (Veronica Vaida Festschrift)
5   Y.-C. Chang, B. Xiong, D. H. Bross, B. Ruscic, and C. Y. Ng,
A Vacuum Ultraviolet laser Pulsed Field Ionization-Photoion Study of Methane (CH4): Determination of the Appearance Energy of Methylium From Methane with Unprecedented Precision and the Resulting Impact on the Bond Dissociation Energies of CH4 and CH4+.
Phys. Chem. Chem. Phys. 19, 9592-9605 (2017) [DOI: 10.1039/c6cp08200a] (part of 2017 PCCP Hot Articles collection)
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.