o-Xylene
- Formula: C8H10
- Molecular weight: 106.1650
- IUPAC Standard InChI: InChI=1S/C8H10/c1-7-5-3-4-6-8(7)2/h3-6H,1-2H3
- IUPAC Standard InChIKey: CTQNGGLPUBDAKN-UHFFFAOYSA-N
- CAS Registry Number: 95-47-6
- 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. - Isotopologues:
- Other names: Benzene, 1,2-dimethyl-; o-Dimethylbenzene; o-Methyltoluene; o-Xylol; 1,2-Dimethylbenzene; 1,2-Xylene; 3,4-Xylene; ortho-Xylene; NSC 60920; 2-Methyltoluene; UN 1307; 1,2-dimethyl-benzene ( o-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 | 19.0 ± 1.1 | kJ/mol | Ccb | Prosen, Gilmont, et al., 1945 | Hf by Prosen, Johnson, et al., 1946; ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas | 353.6 ± 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 |
|---|---|---|---|
| 96.05 | 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 |
| 122.9 | 273.15 | ||
| 132.5 ± 0.4 | 298.15 | ||
| 133.2 | 300. | ||
| 171.6 | 400. | ||
| 206.0 | 500. | ||
| 235.1 | 600. | ||
| 259.5 | 700. | ||
| 280.0 | 800. | ||
| 297.4 | 900. | ||
| 312.2 | 1000. | ||
| 324.9 | 1100. | ||
| 335.8 | 1200. | ||
| 345.2 | 1300. | ||
| 353.3 | 1400. | ||
| 360.3 | 1500. |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 168.2 ± 1.7 | 393. | Taylor W.J., 1946 | Please also see Pitzer K.S., 1943.; GT |
| 182.0 ± 1.7 | 428. | ||
| 192.5 ± 2.1 | 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, Gilmont, et al., 1945
Prosen, E.J.; Gilmont, R.; Rossini, F.D.,
Heats of combustion of benzene, toluene, ethyl-benzene, o-xylene, m-xylene, p-xylene, n-propylbenzene, and styrene,
J. Res. NBS, 1945, 34, 65-70. [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]
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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