p-Xylene
- Formula: C8H10
- Molecular weight: 106.1650
- IUPAC Standard InChI: InChI=1S/C8H10/c1-7-3-5-8(2)6-4-7/h3-6H,1-2H3
- IUPAC Standard InChIKey: URLKBWYHVLBVBO-UHFFFAOYSA-N
- CAS Registry Number: 106-42-3
- 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. - Isotopologues:
- Other names: Benzene, 1,4-dimethyl-; p-Dimethylbenzene; p-Xylol; 1,4-Dimethylbenzene; 1,4-Xylene; p-Methyltoluene; para-Xylene; Chromar; Scintillar; 4-Methyltoluene; NSC 72419; UN 1307; 1,4-dimethyl-benzene ( p-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 | 17.9 ± 1.0 | kJ/mol | Ccb | Prosen, Johnson, et al., 1946 | ALS |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 44.67 | 50. | Chao J., 1986 | Among 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 |
| 54.98 | 100. | ||
| 69.79 | 150. | ||
| 87.00 | 200. | ||
| 115.7 | 273.15 | ||
| 126.0 | 298.15 | ||
| 126.8 | 300. | ||
| 167.4 | 400. | ||
| 203.3 | 500. | ||
| 233.2 | 600. | ||
| 258.1 | 700. | ||
| 278.9 | 800. | ||
| 296.4 | 900. | ||
| 311.4 | 1000. | ||
| 324.2 | 1100. | ||
| 335.2 | 1200. | ||
| 344.7 | 1300. | ||
| 352.8 | 1400. | ||
| 359.9 | 1500. |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 163.2 ± 1.7 | 393. | Hossenlopp I.A., 1981 | Please also see Pitzer K.S., 1943, Taylor W.J., 1946.; GT |
| 166.52 ± 0.33 | 398.15 | ||
| 175.82 ± 0.35 | 423.15 | ||
| 178.2 ± 1.7 | 428. | ||
| 185.40 ± 0.37 | 448.15 | ||
| 189.1 ± 1.7 | 463. | ||
| 194.17 ± 0.39 | 473.15 | ||
| 202.92 ± 0.41 | 498.15 | ||
| 211.09 ± 0.42 | 523.15 |
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
Go To: Top, Gas phase thermochemistry data, References
- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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