Selected ATcT [1, 2] enthalpy of formation based on version 1.122h 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].
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Species Name |
Formula |
Image |
ΔfH°(0 K) |
ΔfH°(298.15 K) |
Uncertainty |
Units |
Relative Molecular Mass |
ATcT ID |
Hydrogen bromide | HBr (aq, 3000 H2O) | | | -120.73 | ± 0.15 | kJ/mol | 80.9119 ± 0.0010 | 10035-10-6*842 |
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Top contributors to the provenance of ΔfH° of HBr (aq, 3000 H2O)The 20 contributors listed below account only for 67.2% of the provenance of ΔfH° of HBr (aq, 3000 H2O). A total of 180 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.
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Contribution (%) | TN ID | Reaction | Measured Quantity | Reference | 12.9 | 994.1 | Cl2 (g) + 2 Br- (aq) → Br2 (cr,l) + 2 Cl- (aq)  | ΔrH°(298.15 K) = -91.29 ± 0.40 (×1.957) kJ/mol | Johnson 1963, as quoted by CODATA Key Vals | 12.3 | 994.2 | Cl2 (g) + 2 Br- (aq) → Br2 (cr,l) + 2 Cl- (aq)  | ΔrH°(298.15 K) = -91.29 ± 0.80 kJ/mol | Sunner 1964, as quoted by CODATA Key Vals | 6.7 | 946.2 | Br2 (cr,l) → Br2 (g)  | ΔrH°(298.15 K) = 7.386 ± 0.027 kcal/mol | Hildenbrand 1958 | 4.7 | 978.1 | HBr (g) → HBr (aq, 2570 H2O)  | ΔrH°(298.15 K) = -20.286 ± 0.012 kcal/mol | Vanderzee 1963 | 4.3 | 1004.1 | [HBr]+ (g) → H (g) + Br+ (g)  | ΔrH°(0 K) = 31394.5 ± 20 (×2.327) cm-1 | Haugh 1971, Norling 1935 | 3.1 | 974.1 | 1/2 H2 (g) + 1/2 Br2 (cr,l) → HBr (aq)  | ΔrG°(298.15 K) = -102.81 ± 0.80 kJ/mol | Jones 1934, as quoted by CODATA Key Vals | 2.6 | 972.1 | 1/2 H2 (g) + 1/2 Br2 (g) → HBr (g)  | ΔrH°(376.15 K) = -12.470 ± 0.170 kcal/mol | Lacher 1956a, Lacher 1956 | 2.4 | 4360.1 | CH3Br (g) → [CH3]+ (g) + Br (g)  | ΔrH°(0 K) = 12.834 ± 0.002 eV | Song 2001 | 1.9 | 994.3 | Cl2 (g) + 2 Br- (aq) → Br2 (cr,l) + 2 Cl- (aq)  | ΔrH°(298.15 K) = -91.55 ± 2.00 kJ/mol | Thomsen 1882, as quoted by CODATA Key Vals | 1.9 | 965.12 | HBr (g) → H (g) + Br (g)  | ΔrH°(0 K) = 86.47 ± 0.2 kcal/mol | Feller 2008 | 1.9 | 966.6 | HBr (g) + Cl (g) → HCl (g) + Br (g)  | ΔrH°(0 K) = -15.68 ± 0.2 kcal/mol | Feller 2008 | 1.9 | 1090.1 | HI (g) + Br (g) → HBr (g) + I (g)  | ΔrH°(0 K) = -16.14 ± 0.2 kcal/mol | Feller 2008 | 1.8 | 1102.1 | Br2 (cr,l) + 3 I- (aq) → [I3]- (aq) + 2 Br- (aq)  | ΔrH°(298.15 K) = -29.355 ± 0.364 kcal/mol | Wu 1963 | 1.6 | 4687.1 | CH3CH2Br (g) → [CH3CH2]+ (g) + Br (g)  | ΔrH°(0 K) = 11.130 ± 0.005 eV | Baer 2000 | 1.4 | 1913.1 | CH4 (g) + Br (g) → CH3 (g) + HBr (g)  | ΔrH°(0 K) = 5929 ± 80 cm-1 | Czako 2013 | 1.3 | 1004.3 | [HBr]+ (g) → H (g) + Br+ (g)  | ΔrH°(0 K) = 31358 ± 15 (×5.536) cm-1 | Penno 1998, Norling 1935, est unc | 1.1 | 4344.1 | CH3Cl (g) + 3/2 O2 (g) → CO2 (g) + H2O (cr,l) + HCl (aq, 600 H2O)  | ΔrH°(298.15 K) = -764.00 ± 0.50 (×1.576) kJ/mol | Fletcher 1971 | 0.9 | 4852.1 | CBr2O (l) + H2O (cr,l) → CO2 (g) + 2 HBr (aq, 5000 H2O)  | ΔrH°(298.15 K) = -49.06 ± 0.32 kcal/mol | Anthoney 1970, as quoted by Pedley 1986 | 0.8 | 2539.2 | HCO (g) + HBr (g) → CH2O (g) + Br (g)  | ΔrG°(385 K) = 6.79 ± 0.64 (×1.915) kJ/mol | Becerra 1997, Nava 1981, 3rd Law, note unc | 0.8 | 4686.1 | CH2CH2 (g) + HBr (g) → CH3CH2Br (g)  | ΔrG°(546 K) = -8.340 ± 0.203 kJ/mol | Lane 1953, 3rd Law |
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Top 10 species with enthalpies of formation correlated to the ΔfH° of HBr (aq, 3000 H2O) |
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.
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Correlation Coefficent (%) | Species Name | Formula | Image | ΔfH°(0 K) | ΔfH°(298.15 K) | Uncertainty | Units | Relative Molecular Mass | ATcT ID | 99.9 | Hydrogen bromide | HBr (aq, 2000 H2O) | | | -120.68 | ± 0.15 | kJ/mol | 80.9119 ± 0.0010 | 10035-10-6*841 | 99.9 | Hydrogen bromide | HBr (aq, 2570 H2O) | | | -120.71 | ± 0.15 | kJ/mol | 80.9119 ± 0.0010 | 10035-10-6*952 | 99.8 | Hydrogen bromide | HBr (aq, 5000 H2O) | | | -120.78 | ± 0.15 | kJ/mol | 80.9119 ± 0.0010 | 10035-10-6*844 | 99.8 | Hydrogen bromide | HBr (aq) | | | -120.96 | ± 0.15 | kJ/mol | 80.9119 ± 0.0010 | 10035-10-6*800 | 99.8 | Bromide | Br- (aq) | | | -120.96 | ± 0.15 | kJ/mol | 79.90455 ± 0.00100 | 24959-67-9*800 | 99.7 | Hydrogen bromide | HBr (aq, 1000 H2O) | | | -120.58 | ± 0.15 | kJ/mol | 80.9119 ± 0.0010 | 10035-10-6*839 | 99.7 | Hydrogen bromide | HBr (aq, 600 H2O) | | | -120.48 | ± 0.15 | kJ/mol | 80.9119 ± 0.0010 | 10035-10-6*834 | 93.9 | Hydrogen bromide | HBr (g) | | -27.98 | -35.82 | ± 0.14 | kJ/mol | 80.9119 ± 0.0010 | 10035-10-6*0 | 93.8 | Bromoniumyl | [HBr]+ (g) | | 1097.70 | 1089.85 | ± 0.14 | kJ/mol | 80.9114 ± 0.0010 | 12258-64-9*0 | 90.6 | Ammonium bromide | (NH4)Br (cr) | | -253.72 | -270.30 | ± 0.16 | kJ/mol | 97.9425 ± 0.0010 | 12124-97-9*510 |
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Most Influential reactions involving HBr (aq, 3000 H2O)Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.
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Influence Coefficient | TN ID | Reaction | Measured Quantity | Reference | 0.834 | 992.1 | HBr (aq, 3000 H2O) → HBr (aq, 5000 H2O)  | ΔrH°(298.15 K) = -0.012 ± 0.002 kcal/mol | Parker 1965, NBS TN270, NBS Tables 1989 | 0.575 | 980.1 | HBr (aq, 2570 H2O) → HBr (aq, 3000 H2O)  | ΔrH°(298.15 K) = -0.004 ± 0.002 kcal/mol | Parker 1965, NBS Tables 1989, est unc | 0.571 | 991.1 | HBr (aq, 2000 H2O) → HBr (aq, 3000 H2O)  | ΔrH°(298.15 K) = -0.012 ± 0.002 kcal/mol | Parker 1965, NBS TN270, NBS Tables 1989 | 0.218 | 987.2 | HBr (aq, 3000 H2O) → HBr (aq)  | ΔrH°(298.15 K) = -0.056 ± 0.004 kcal/mol | Parker 1965, NBS TN270, NBS Tables 1989 |
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References
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1
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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]
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2
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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]
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3
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B. Ruscic and D. H. Bross, Active Thermochemical Tables (ATcT) values based on ver. 1.122h of the Thermochemical Network (2020); available at ATcT.anl.gov |
4
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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)
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5
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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)
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6
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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]
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Formula
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The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.
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Uncertainties
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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.
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Website Functionality Credits
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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/.
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Acknowledgement
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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.
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