Benzene, 1,3-dimethyl-
- Formula: C8H10
- Molecular weight: 106.1650
- IUPAC Standard InChI: InChI=1S/C8H10/c1-7-4-3-5-8(2)6-7/h3-6H,1-2H3
- IUPAC Standard InChIKey: IVSZLXZYQVIEFR-UHFFFAOYSA-N
- CAS Registry Number: 108-38-3
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: m-Xylene; m-Dimethylbenzene; m-Xylol; 1,3-Dimethylbenzene; 1,3-Xylene; 2,4-Xylene; m-Methyltoluene; meta-Xylene; NSC 61769; UN 1307; 1,3-dimethylbenzene (m-xylene)
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Gas phase thermochemistry data
Go To: Top, References, Notes
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 |
|---|---|---|---|---|---|
| ΔfH°gas | 17.2 ± 0.75 | kJ/mol | Ccb | Prosen, Johnson, et al., 1946 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas | 358.2 ± 1.3 | J/mol*K | N/A | Pitzer K.S., 1943 | GT |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 87.21 | 200. | Draeger, 1985 | Discrepancies with other statistically calculated values of S(T) and Cp(T) [ Pitzer K.S., 1943, Taylor W.J., 1946, Hastings S.H., 1957, Chao J., 1984] do not exceed 1.5 J/mol*K.; GT |
| 115.6 | 273.15 | ||
| 125.8 ± 0.4 | 298.15 | ||
| 126.6 | 300. | ||
| 167.1 | 400. | ||
| 202.9 | 500. | ||
| 232.8 | 600. | ||
| 257.7 | 700. | ||
| 278.6 | 800. | ||
| 296.2 | 900. | ||
| 311.2 | 1000. | ||
| 324.1 | 1100. | ||
| 335.1 | 1200. | ||
| 344.6 | 1300. | ||
| 352.8 | 1400. | ||
| 359.8 | 1500. |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 163.6 ± 1.7 | 393. | Taylor W.J., 1946 | Please also see Pitzer K.S., 1943.; GT |
| 177.4 ± 1.7 | 428. | ||
| 190.0 ± 1.7 | 463. |
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]
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]
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]
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]
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]
Chao J., 1984
Chao J.,
Chemical thermodynamic properties of toluene, o-, m- and p-xylenes,
Thermochim. Acta, 1984, 72, 323-334. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, References
- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas S°gas Entropy of gas at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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