Selected ATcT [1, 2] enthalpy of formation based on version 1.122x of the Thermochemical Network [3]This version of ATcT results was generated from an expansion of version 1.122v [4] to include species relevant to the study of bond dissociation enthalpies of representative aromatic aldehydes [5].
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Species Name |
Formula |
Image |
ΔfH°(0 K) |
ΔfH°(298.15 K) |
Uncertainty |
Units |
Relative Molecular Mass |
ATcT ID |
Acetylene | HCCH (g) | | 228.84 | 228.28 | ± 0.12 | kJ/mol | 26.0373 ± 0.0016 | 74-86-2*0 |
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Representative Geometry of HCCH (g) |
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spin ON spin OFF |
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Top contributors to the provenance of ΔfH° of HCCH (g)The 20 contributors listed below account only for 25.8% of the provenance of ΔfH° of HCCH (g). A total of 741 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 | 3.3 | 1987.1 | 2 H2 (g) + C (graphite) → CH4 (g)  | ΔrG°(1165 K) = 37.521 ± 0.068 kJ/mol | Smith 1946, note COf, 3rd Law | 2.4 | 1891.2 | CO (g) → C+ (g) + O (g)  | ΔrH°(0 K) = 22.3713 ± 0.0015 eV | Ng 2007 | 1.7 | 120.2 | 1/2 O2 (g) + H2 (g) → H2O (cr,l)  | ΔrH°(298.15 K) = -285.8261 ± 0.040 kJ/mol | Rossini 1939, Rossini 1931, Rossini 1931b, note H2Oa, Rossini 1930 | 1.4 | 2139.1 | CH2CH2 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (cr,l)  | ΔrH°(298.15 K) = -1411.18 ± 0.30 kJ/mol | Rossini 1937 | 1.4 | 2205.7 | HCCH (g) → 2 C (g) + 2 H (g)  | ΔrH°(0 K) = 1626.04 ± 0.56 kJ/mol | Harding 2008 | 1.3 | 2251.1 | HCCH (g) → CCH (g) + H (g)  | ΔrH°(0 K) = 46074 ± 8 cm-1 | Mordaunt 1994 | 1.1 | 2223.1 | CH2CH2 (g) → [HCCH]+ (g) + H2 (g)  | ΔrH°(0 K) = 13.135 ± 0.005 (×1.325) eV | Malow 1999, est unc | 1.1 | 2223.2 | CH2CH2 (g) → [HCCH]+ (g) + H2 (g)  | ΔrH°(0 K) = 13.135 ± 0.005 (×1.325) eV | Mahnert 1996 | 1.1 | 2204.13 | HCCH (g) → 2 C (g) + 2 H (g)  | ΔrH°(0 K) = 388.71 ± 0.15 kcal/mol | Karton 2007a | 1.1 | 1923.7 | HCCH (g) → 2 H (g) + C2 (g)  | ΔrH°(0 K) = 244.65 ± 0.15 kcal/mol | Karton 2007a | 1.1 | 1899.5 | C (graphite) + CO2 (g) → 2 CO (g)  | ΔrG°(1165 K) = -33.545 ± 0.058 kJ/mol | Smith 1946, note COf, 3rd Law | 1.0 | 1843.7 | C (graphite) + O2 (g) → CO2 (g)  | ΔrH°(298.15 K) = -393.464 ± 0.024 kJ/mol | Hawtin 1966, note CO2e | 1.0 | 2241.7 | CCH (g) → 2 C (g) + H (g)  | ΔrH°(0 K) = 1075.25 ± 0.56 kJ/mol | Harding 2008 | 0.9 | 2221.6 | HCCH (g) + H2 (g) → CH2CH2 (g)  | ΔrH°(0 K) = -167.71 ± 0.70 kJ/mol | Harding 2007 | 0.9 | 2205.5 | HCCH (g) → 2 C (g) + 2 H (g)  | ΔrH°(0 K) = 1626.04 ± 0.70 kJ/mol | Harding 2008, Ferguson 2013 | 0.9 | 2205.4 | HCCH (g) → 2 C (g) + 2 H (g)  | ΔrH°(0 K) = 1626.21 ± 0.70 kJ/mol | Bomble 2006 | 0.9 | 2205.11 | HCCH (g) → 2 C (g) + 2 H (g)  | ΔrH°(0 K) = 1626.15 ± 0.70 kJ/mol | Harding 2007 | 0.9 | 2220.11 | HCCH (g) + 2 H2 (g) → CH3CH3 (g)  | ΔrH°(0 K) = -71.01 ± 0.20 kcal/mol | Karton 2007 | 0.8 | 2371.10 | HCN (g) + C (g) + H (g) → HCCH (g) + N (g)  | ΔrH°(0 K) = -357.48 ± 0.56 kJ/mol | Harding 2008 | 0.8 | 2205.6 | HCCH (g) → 2 C (g) + 2 H (g)  | ΔrH°(0 K) = 1625.72 ± 0.74 kJ/mol | Harding 2008 |
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Top 10 species with enthalpies of formation correlated to the ΔfH° of HCCH (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.
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Correlation Coefficent (%) | Species Name | Formula | Image | ΔfH°(0 K) | ΔfH°(298.15 K) | Uncertainty | Units | Relative Molecular Mass | ATcT ID | 100.0 | Acetylene cation | [HCCH]+ (g) | | 1328.86 | 1328.19 | ± 0.12 | kJ/mol | 26.0367 ± 0.0016 | 25641-79-6*0 | 82.2 | Ethynyl | CCH (g) | | 563.89 | 568.00 | ± 0.14 | kJ/mol | 25.0293 ± 0.0016 | 2122-48-7*0 | 80.0 | Ethynylium | [CCH]+ (g) | | 1687.60 | 1690.94 | ± 0.15 | kJ/mol | 25.0288 ± 0.0016 | 16456-59-0*0 | 63.1 | Ethynide | [CCH]- (g) | | 277.44 | 280.85 | ± 0.18 | kJ/mol | 25.0299 ± 0.0016 | 29075-95-4*0 | 60.8 | Carbon cation | C+ (g) | | 1797.864 | 1803.462 | ± 0.044 | kJ/mol | 12.01015 ± 0.00080 | 14067-05-1*0 | 60.8 | Carbon | C (g, quintuplet) | | 1114.974 | 1120.120 | ± 0.044 | kJ/mol | 12.01070 ± 0.00080 | 7440-44-0*3 | 60.8 | Carbon | C (g, singlet) | | 833.342 | 838.488 | ± 0.044 | kJ/mol | 12.01070 ± 0.00080 | 7440-44-0*2 | 60.8 | Carbon | C (g, triplet) | | 711.411 | 716.896 | ± 0.044 | kJ/mol | 12.01070 ± 0.00080 | 7440-44-0*1 | 60.8 | Carbon | C (g) | | 711.411 | 716.896 | ± 0.044 | kJ/mol | 12.01070 ± 0.00080 | 7440-44-0*0 | 60.8 | Carbon dication | [C]+2 (g) | | 4150.480 | 4155.627 | ± 0.044 | kJ/mol | 12.00960 ± 0.00080 | 16092-61-8*0 |
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Most Influential reactions involving HCCH (g)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 | 0.980 | 2207.1 | HCCH (g) → [HCCH]+ (g)  | ΔrH°(0 K) = 91953.77 ± 0.06 cm-1 | Tang 2006 | 0.872 | 2256.5 | HCCH (g) → [CCH]+ (g) + H (g)  | ΔrH°(0 K) = 17.3576 ± 0.0010 eV | Jarvis 1999, Weitzel 2001 | 0.822 | 6169.6 | (CHCH)(CHCH2CH)(CHCH (g) → CH2(CHCHCHCH) (g) + HCCH (g)  | ΔrG°(607.6 K) = 2.189 ± 0.192 kcal/mol | Walsh 1975, 3rd Law | 0.641 | 2251.1 | HCCH (g) → CCH (g) + H (g)  | ΔrH°(0 K) = 46074 ± 8 cm-1 | Mordaunt 1994 | 0.598 | 6165.1 | CHICHI (g, cis) → HCCH (g) + I2 (g)  | ΔrG°(600 K) = 0.60 ± 0.10 kcal/mol | Furuyama 1968 | 0.598 | 6166.1 | CHICHI (g, trans) → HCCH (g) + I2 (g)  | ΔrG°(600 K) = 1.26 ± 0.10 kcal/mol | Furuyama 1968 | 0.402 | 2453.6 | HCCNH (g) + CH4 (g) → CH3NH (g) + HCCH (g)  | ΔrH°(0 K) = 87.84 ± 1.5 kJ/mol | Klippenstein 2017 | 0.394 | 4963.8 | HCCH (g) + ClCCCl (g) → 2 HCCCl (g)  | ΔrH°(0 K) = -0.76 ± 0.25 kcal/mol | Karton 2017, Karton 2011, Karton 2007, Karton 2006 | 0.363 | 5408.12 | HCCH (g) + FCCF (g) → 2 HCCF (g)  | ΔrH°(0 K) = -5.22 ± 0.20 kcal/mol | Karton 2011 | 0.330 | 4511.6 | HOCCOH (g) + HCCH (g) → 2 HCCOH (g, singlet)  | ΔrH°(0 K) = -20.17 ± 2.00 kJ/mol | Klippenstein 2017 | 0.293 | 5426.4 | HCCH (g) + BrCCBr (g) → 2 HCCBr (g)  | ΔrH°(0 K) = 0.45 ± 1.0 kcal/mol | Ruscic G4 | 0.280 | 5404.2 | HCCH (g) + 2 CH3Br (g) → BrCCBr (g) + 2 CH4 (g)  | ΔrH°(0 K) = 2.34 ± 1.0 kcal/mol | Ruscic G4 | 0.265 | 2217.6 | HCCH (g) → HCCH (g, cis-triplet)  | ΔrH°(0 K) = 30900 ± 230 cm-1 | Sherrill 2000 | 0.242 | 5426.3 | HCCH (g) + BrCCBr (g) → 2 HCCBr (g)  | ΔrH°(0 K) = 0.65 ± 1.1 kcal/mol | Ruscic G3X | 0.231 | 5404.1 | HCCH (g) + 2 CH3Br (g) → BrCCBr (g) + 2 CH4 (g)  | ΔrH°(0 K) = 3.37 ± 1.1 kcal/mol | Ruscic G3X | 0.223 | 5409.12 | HCCH (g) + CH3F (g) → HCCF (g) + CH4 (g)  | ΔrH°(0 K) = 8.81 ± 0.20 kcal/mol | Karton 2011 | 0.214 | 3006.5 | CH3CHC (g, triplet) + HCCH (g) → CCH2 (g, triplet) + CH3CCH (g)  | ΔrH°(0 K) = -13.16 ± 0.85 kcal/mol | Ruscic W1RO | 0.209 | 7423.6 | HCCCCH (g) + CCH (g) → CCCCH (g) + HCCH (g)  | ΔrH°(0 K) = 9.81 ± 2.00 kJ/mol | Klippenstein 2017 | 0.208 | 4962.1 | HCCCl (g) + CH2CH2 (g) → CH2CHCl (g) + HCCH (g)  | ΔrH°(0 K) = -7.80 ± 0.25 kcal/mol | Karton 2017, Karton 2011, Karton 2007, Karton 2006 | 0.205 | 2234.1 | HCCH (g) → CCH2 (g)  | ΔrH°(0 K) = 43.53 ± 0.15 kcal/mol | Lee 2013 |
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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. 1.122x of the Thermochemical Network, Argonne National Laboratory, Lemont, Illinois 2022; available at ATcT.anl.gov [DOI: 10.17038/CSE/1885922]
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4
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D. P. Zaleski, R. Sivaramakrishnan, H. R. Weller, N. A Seifert, D. H. Bross, B. Ruscic, K. B. Moore III, S. N. Elliott, A. V. Copan, L. B. Harding, S. J. Klippenstein, R. W. Field, and K. Prozument,
Substitution Reactions in the Pyrolysis of Acetone Revealed through a Modeling, Experiment, Theory Paradigm.
J. Am. Chem. Soc. 143, 3124-3152 (2021)
[DOI: 10.1021/jacs.0c11677]
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5
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Y. Ren, L. Zhou, A. Mellouki, V. Daƫle, M. Idir, S. S. Brown, B. Ruscic, Robert S. Paton, M. R. McGillen, and A. R. Ravishankara,
Reactions of NO3 with Aromatic Aldehydes: Gas-Phase Kinetics and Insights into the Mechanism of the Reaction.
Atmos. Chem. Phys. 21, 13537-13551 (2021)
[DOI: 10.5194/acp2021-228]
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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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7
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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]
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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 [6,7]).
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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