Cyclopentane, heneicosyl-
- Formula: C26H52
- Molecular weight: 364.6911
- IUPAC Standard InChI: InChI=1S/C26H52/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-23-26-24-21-22-25-26/h26H,2-25H2,1H3
- IUPAC Standard InChIKey: GNECQVKDNNGLCG-UHFFFAOYSA-N
- CAS Registry Number: 6703-82-8
- 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: Heneicosane, 1-cyclopentyl-; n-Heneicosylcyclopentane
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Condensed phase thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -648.6 ± 6.7 | kJ/mol | Ccb | Knowlton and Huffman, 1944 | Reanalyzed by Cox and Pilcher, 1970, Original value = -650.6 kJ/mol |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°liquid | -17014.2 ± 6.7 | kJ/mol | Ccb | Knowlton and Huffman, 1944 | Reanalyzed by Cox and Pilcher, 1970, Original value = -17013. kJ/mol; Corresponding ΔfHºliquid = -648.60 kJ/mol (simple calculation by NIST; no Washburn corrections) |
Phase change data
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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:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| Tfus | 318.35 | K | N/A | Anonymous, 1968 | Uncertainty assigned by TRC = 0.5 K; TRC |
| Tfus | 318.4 | K | N/A | Anonymous, 1952 | Uncertainty assigned by TRC = 1. K; TRC |
| Tfus | 45.2 | K | N/A | Whitmore, Herr, et al., 1945 | Uncertainty assigned by TRC = 1.5 K; TRC |
Enthalpy of vaporization
| ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 93.8 | 513. | A,MG | Stephenson and Malanowski, 1987 | Based on data from 498. to 537. K. See also Schiessler and Whitmore, 1955.; AC |
References
Go To: Top, Condensed phase thermochemistry data, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Knowlton and Huffman, 1944
Knowlton, J.W.; Huffman, H.M.,
The heats of combustion of some substituted eicosanes, heneicosanes and docosanes,
J. Am. Chem. Soc., 1944, 66, 1492-1494. [all data]
Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G.,
Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]
Anonymous, 1968
Anonymous, R.,
Properties of hydrocarbon of high molecular weight, Am. Pet. Inst. Res. Proj. 42, Penn. State Univ., 1968. [all data]
Anonymous, 1952
Anonymous, R.,
, Physical Properties of Chemical Substances, Dow Chemical Co., 1952. [all data]
Whitmore, Herr, et al., 1945
Whitmore, F.C.; Herr, C.H.; Clarke, D.G.; Rowland, C.S.; Schiessler, R.W.,
Higher Hydrocarbons. III. The Wolf-Kishner Reactioon,
J. Am. Chem. Soc., 1945, 67, 2059. [all data]
Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw,
Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2
. [all data]
Schiessler and Whitmore, 1955
Schiessler, R.W.; Whitmore, F.C.,
Properties of High Molecular Weight Hydrocarbons,
Ind. Eng. Chem., 1955, 47, 8, 1660-1665, https://doi.org/10.1021/ie50548a054
. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, Phase change data, References
- Symbols used in this document:
Tfus Fusion (melting) point ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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