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p-Xylene

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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
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity Value Units Method Reference Comment
Deltafgas17.9 ± 1.0kJ/molCcbProsen, Johnson, et al., 1946ALS

Constant pressure heat capacity of gas

Cp,gas (J/mol*K) Temperature (K) Reference Comment
44.6750.Chao J., 1986Among the known statistically calculated values [ Pitzer K.S., 1943, Taylor W.J., 1946, Draeger J.A., 1981, Draeger, 1985], the recommended S(T) and Cp(T) values are in best agreement with the experimental data. With the exception of [ Draeger J.A., 1981], all calculations agree within 1.2 J/mol*K for S(T) and Cp(T). Discrepancy with Cp(1000 K) calculated by [ Draeger J.A., 1981] amounts to 4.7 J/mol*K.; GT
54.98100.
69.79150.
87.00200.
115.7273.15
126.0298.15
126.8300.
167.4400.
203.3500.
233.2600.
258.1700.
278.9800.
296.4900.
311.41000.
324.21100.
335.21200.
344.71300.
352.81400.
359.91500.

Constant pressure heat capacity of gas

Cp,gas (J/mol*K) Temperature (K) Reference Comment
163.2 ± 1.7393.Hossenlopp I.A., 1981Please also see Pitzer K.S., 1943, Taylor W.J., 1946.; GT
166.52 ± 0.33398.15
175.82 ± 0.35423.15
178.2 ± 1.7428.
185.40 ± 0.37448.15
189.1 ± 1.7463.
194.17 ± 0.39473.15
202.92 ± 0.41498.15
211.09 ± 0.42523.15

References

Go To: Top, Gas phase thermochemistry data, Notes

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

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]

Chao J., 1986
Chao J., Thermodynamic properties of key organic oxygen compounds in the carbon range C1 to C4. Part 2. Ideal gas properties, J. Phys. Chem. Ref. Data, 1986, 15, 1369-1436. [all data]

Pitzer K.S., 1943
Pitzer K.S., The thermodynamics and molecular structure of benzene and its methyl derivatives, J. Am. Chem. Soc., 1943, 65, 803-829. [all data]

Taylor W.J., 1946
Taylor W.J., Heats, equilibrium constants, and free energies of formation of the alkylbenzenes, J. Res. Nat. Bur. Stand., 1946, 37, 95-122. [all data]

Draeger J.A., 1981
Draeger J.A., Ideal gas thermodynamic properties of 1,4-dimethylbenzene, J. Chem. Phys., 1981, 74, 4748-4749. [all data]

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]

Hossenlopp I.A., 1981
Hossenlopp I.A., Vapor heat capacities and enthalpies of vaporization of four aromatic and/or cycloalkane hydrocarbons, J. Chem. Thermodyn., 1981, 13, 423-428. [all data]


Notes

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