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Benzene, 1,2,3,5-tetramethyl-

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Gas phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity Value Units Method Reference Comment
Deltafgas-43.2 ± 1.3kJ/molCcbDraeger, 1985Unpublished measurement of W.D.Good; ALS
Deltafgas-44.4 ± 1.2kJ/molN/AGood, 1975Value computed using «DELTA»fHliquid° value of -96.4±1.2 kj/mol from Good, 1975 and «DELTA»vapH° value of 52.0±0.17 kj/mol from missing citation.; DRB
Deltafgas-46.5 ± 3.0kJ/molN/AProsen, Johnson, et al., 1946Value computed using «DELTA»fHliquid° value of -98.5±3 kj/mol from Prosen, Johnson, et al., 1946 and «DELTA»vapH° value of 52.0±0.17 kj/mol from missing citation.; DRB

Constant pressure heat capacity of gas

Cp,gas (J/mol*K) Temperature (K) Reference Comment
135.0200.Draeger, 1985There is an appreciable difference between values of S(T) and Cp(T) for tetra-, penta-, and hexamethylbenzene from earlier statistical thermodynamics calculation [ Hastings S.H., 1957] and those obtained by [ Draeger, 1985] (up to 5, 9, and 16 J/mol*K, respectively). Results [ Draeger, 1985] are more reliable and they agree with experimental data for hexamethylbenzene.; GT
168.8273.15
180.7 ± 0.4298.15
181.6300.
229.3400.
273.0500.
310.6600.
342.6700.
369.8800.
393.0900.
413.01000.
430.11100.
444.91200.
457.71300.
468.71400.
478.31500.

References

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Draeger, 1985
Draeger, J.A., The methylbenzenes II. Fundamental vibrational shifts, statistical thermodynamic functions, and properties of formation, J. Chem. Thermodyn., 1985, 17, 263-275. [all data]

Good, 1975
Good, W.D., The standard enthalpies of combustion and formation of n-butylbenzene, the dimethylethylbenzenes, and the tetramethylbenzenes in the condensed state, J. Chem. Thermodyn., 1975, 7, 49-59. [all data]

Prosen, Johnson, et al., 1946
Prosen, E.J.; Johnson, W.H.; Rossini, F.D., Heats of combustion and formation at 25°C of the alkylbenzenes through C10H14, and of the higher normal monoalkylbenzenes, J. Res. NBS, 1946, 36, 455-461. [all data]

Hastings S.H., 1957
Hastings S.H., Thermodynamic properties of selected methylbenzenes from 0 to 1000 K, J. Phys. Chem., 1957, 61, 730-735. [all data]


Notes

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