Cyclohexane, ethyl-
- Formula: C8H16
- Molecular weight: 112.2126
- IUPAC Standard InChI: InChI=1S/C8H16/c1-2-8-6-4-3-5-7-8/h8H,2-7H2,1H3
- IUPAC Standard InChIKey: IIEWJVIFRVWJOD-UHFFFAOYSA-N
- CAS Registry Number: 1678-91-7
- 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: Ethylcyclohexane
- Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Other data available:
- Data at other public NIST sites:
- Options:
Data at NIST subscription sites:
NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.
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:
DRB - Donald R. Burgess, Jr.
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 | -172.6 | kJ/mol | N/A | Baroody and Carpenter, 1972 | Value computed using ΔfHliquid° value of -213.0 kj/mol from Baroody and Carpenter, 1972 and ΔvapH° value of 40.4 kj/mol from Prosen, Johnson, et al., 1946.; DRB |
| ΔfH°gas | -171.8 ± 1.5 | kJ/mol | Ccb | Prosen, Johnson, et al., 1946 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas | 382.67 | J/mol*K | N/A | Huffman H.M., 1949 | GT |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 40.95 | 50. | Thermodynamics Research Center, 1997 | p=1 bar. There is an appreciable difference, mainly at high temperatures, with values estimated earlier by a method of increments [ Beckett C.W., 1947].; GT |
| 62.69 | 100. | ||
| 87.23 | 150. | ||
| 111.7 | 200. | ||
| 150.0 | 273.15 | ||
| 163.9 | 298.15 | ||
| 164.9 | 300. | ||
| 219.6 | 400. | ||
| 268.2 | 500. | ||
| 308.9 | 600. | ||
| 342.9 | 700. | ||
| 371.6 | 800. | ||
| 396.1 | 900. | ||
| 416.9 | 1000. | ||
| 434.8 | 1100. | ||
| 450.2 | 1200. | ||
| 463.4 | 1300. | ||
| 474.9 | 1400. | ||
| 484.8 | 1500. | ||
| 504.2 | 1750. | ||
| 518.2 | 2000. | ||
| 528.6 | 2250. | ||
| 536.3 | 2500. | ||
| 542.3 | 2750. | ||
| 547.0 | 3000. |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 152.23 | 298.15 | Colgate S.O., 1990 | These heat capacities determined from acoustical measurements are significantly lower than statistically calculated values [ Thermodynamics Research Center, 1997] (Cp(298.15 K)=163.9 J/mol*K) and values estimated by a method of increments [ Beckett C.W., 1947] (Cp(298.15 K)=158.6 J/mol*K). At the same time, the heat capacities of ethylbenzene determined in this work are only slightly below than calorimetric ones.; GT |
| 170.36 | 323.15 | ||
| 197.90 | 373.15 | ||
| 217.63 | 408.15 | ||
| 239.88 | 448.15 |
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.
Baroody and Carpenter, 1972
Baroody, E.E.; Carpenter, G.A.,
Heats of formation of propellant compounds (U), Rpt. Naval Ordnance Systems Command Task No. 331-003/067-1/UR2402-001 for Naval Ordance Station, Indian Head, MD, 1972, 1-9. [all data]
Prosen, Johnson, et al., 1946
Prosen, E.J.; Johnson, W.H.; Rossini, F.D.,
Heats of formation and combustion of the normal alkylcyclopentanes and cyclohexanes and the increment per CH2 group for several homologous series of hydrocarbons,
J. Res. NBS, 1946, 37, 51-56. [all data]
Huffman H.M., 1949
Huffman H.M.,
Low-temperature thermal data on eight C8H16 alkylcyclohexanes,
J. Am. Chem. Soc., 1949, 71, 584-592. [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]
Beckett C.W., 1947
Beckett C.W.,
The thermodynamic properties and molecular structure of cyclohexane, methylcyclohexane, ethylcyclohexane, and seven dimethylcyclohexanes,
J. Am. Chem. Soc., 1947, 69, 2488-2495. [all data]
Colgate S.O., 1990
Colgate S.O.,
Acoustical determination of ideal gas heat capacities of three C-8 compounds,
Fluid Phase Equilib., 1990, 60, 191-203. [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
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.