Mesitylene

Formula: C₉H₁₂
Molecular weight: 120.1916
IUPAC Standard InChI: InChI=1S/C9H12/c1-7-4-8(2)6-9(3)5-7/h4-6H,1-3H3
IUPAC Standard InChIKey: AUHZEENZYGFFBQ-UHFFFAOYSA-N
CAS Registry Number: 108-67-8
Chemical structure:
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Other names: Benzene, 1,3,5-trimethyl-; s-Trimethylbenzene; 1,3,5-Trimethylbenzene; sym-Trimethylbenzene; Fleet-X; TMB; UN 2325; 2,4,6-Trimethylbenzene; 3,5-Dimethyltoluene; NSC 9273; Trimethylbenzene; Trimethylbenzol; 1,3,5-trimethylbenzene (mesitylene); Trimethylbenzene (Related); Trimethylbenzol (Related)
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Gas phase thermochemistry data

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Data compiled by: Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity	Value	Units	Method	Reference	Comment
S°_gas	92.09 ± 0.15	cal/mol*K	N/A	Taylor R.D., 1955

Constant pressure heat capacity of gas

C_p,gas (cal/mol*K)	Temperature (K)	Reference	Comment
24.93	200.	Draeger, 1985	Discrepancies with other statistically calculated values of S(T) and Cp(T) amount to 1, 2, and 3 J/mol*K for [ Thermodynamics Research Center, 1997], [ Pitzer K.S., 1943], and [ Taylor W.J., 1946], respectively.
32.50	273.15
35.23 ± 0.1	298.15
35.44	300.
46.30	400.
56.07	500.
64.34	600.
71.27	700.
77.13	800.
82.10	900.
86.33	1000.
89.96	1100.
93.09	1200.
95.77	1300.
98.09	1400.
100.1	1500.

References

Go To: Top, Gas phase thermochemistry data, Notes

Taylor R.D., 1955
Taylor R.D., Entropy, heat capacity, and heats of transition of 1,3,5-trimethylbenzene, J. Chem. Phys., 1955, 23, 1232-1235. [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]

Thermodynamics Research Center, 1997
Thermodynamics Research Center, Selected Values of Properties of Chemical Compounds., Thermodynamics Research Center, Texas A&M University, College Station, Texas, 1997. [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]

Notes

Go To: Top, Gas phase thermochemistry data, References

Symbols used in this document:

C_p,gas Constant pressure heat capacity of gas

S°_gas Entropy of gas at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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C_p,gas	Constant pressure heat capacity of gas
S°_gas	Entropy of gas at standard conditions