Cyclopentane, 1,2-dimethyl-, trans-
- Formula: C7H14
- Molecular weight: 98.1861
- IUPAC Standard InChI: InChI=1S/C7H14/c1-6-4-3-5-7(6)2/h6-7H,3-5H2,1-2H3/t6-,7-/m0/s1
- IUPAC Standard InChIKey: RIRARCHMRDHZAR-BQBZGAKWSA-N
- CAS Registry Number: 822-50-4
- 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. - Stereoisomers:
- Other names: trans-1,2-Dimethylcyclopentane; 1,trans-2-Dimethylcyclopentane; 1,2-Dimethylcyclopentane, trans; t-1,2-Dimethylcyclopentane; (E)-1,2-Dimethylcyclopentane; Cyclopentane, 1,2-dimethyl-
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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 | -136.7 ± 1.3 | kJ/mol | Cm | Johnson, Prosen, et al., 1949 | ALS |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 44.51 | 50. | Thermodynamics Research Center, 1997 | p=1 bar. Recommended values are in close agreement with those calculated by a method of increments [ Epstein M.B., 1949] at low temperatures. Discrepancies increase up to 2-4 J/mol*K at T=1500 K.; GT |
| 61.44 | 100. | ||
| 76.91 | 150. | ||
| 93.09 | 200. | ||
| 122.9 | 273.15 | ||
| 134.5 | 298.15 | ||
| 135.4 | 300. | ||
| 182.7 | 400. | ||
| 225.4 | 500. | ||
| 261.1 | 600. | ||
| 290.9 | 700. | ||
| 316.0 | 800. | ||
| 337.4 | 900. | ||
| 355.6 | 1000. | ||
| 371.3 | 1100. | ||
| 384.8 | 1200. | ||
| 396.5 | 1300. | ||
| 406.5 | 1400. | ||
| 415.3 | 1500. | ||
| 432.5 | 1750. | ||
| 445.0 | 2000. | ||
| 454.2 | 2250. | ||
| 461.1 | 2500. | ||
| 466.5 | 2750. | ||
| 470.7 | 3000. |
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.
Johnson, Prosen, et al., 1949
Johnson, W.H.; Prosen, E.J.; Rossini, F.D.,
Heats of combustion and isomerization of the six C7H14 alkylcyclopentanes,
J. Res. NBS, 1949, 42, 251-255. [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]
Epstein M.B., 1949
Epstein M.B.,
Heats, equilibrium constants, and free energies of formation of the dimethylcyclopentanes,
J. Res. Nat. Bur. Stand., 1949, 43, 245-250. [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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