Cyclopentane

Formula: C₅H₁₀
Molecular weight: 70.1329
IUPAC Standard InChI: InChI=1S/C5H10/c1-2-4-5-3-1/h1-5H2
IUPAC Standard InChIKey: RGSFGYAAUTVSQA-UHFFFAOYSA-N
CAS Registry Number: 287-92-3
Chemical structure:
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Other names: Pentamethylene; UN 1146
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Gas phase thermochemistry data

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Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	-18.26 ± 0.19	kcal/mol	Ccb	McCullough, Pennington, et al., 1959	ALS
Δ_fH°_gas	-18.4	kcal/mol	N/A	Spitzer and Huffman, 1947	Value computed using Δ_fH_liquid° value of -105.6±1.8 kj/mol from Spitzer and Huffman, 1947 and Δ_vapH° value of 28.7 kj/mol from Prosen, Johnson, et al., 1946.; DRB
Δ_fH°_gas	-18.46 ± 0.18	kcal/mol	Ccb	Prosen, Johnson, et al., 1946	ALS

Constant pressure heat capacity of gas

C_p,gas (cal/mol*K)	Temperature (K)	Reference	Comment
8.982	50.	Dorofeeva O.V., 1986	Recommended values are in good agreement with those calculated by [ Kilpatrick J.E., 1947, McCullough J.P., 1959] at low temperatures. The discrepancies increase at higher temperatures and amount to 1.8 J/molK for S(1500 K) and 2.1 J/molK for Cp(1500 K) obtained by [ McCullough J.P., 1959]. Calculation [ Sundaram S., 1963] seems to be incorrect because discrepancies with these data reach 23 and 7 J/mol*K for S(T) and Cp(T), respectively.; GT
9.603	100.
10.83	150.
12.95	200.
17.80	273.15
19.78 ± 0.48	298.15
19.93	300.
28.239	400.
35.863	500.
42.321	600.
47.729	700.
52.294	800.
56.171	900.
59.484	1000.
62.323	1100.
64.761	1200.
66.862	1300.
68.676	1400.
70.249	1500.

Constant pressure heat capacity of gas

C_p,gas (cal/mol*K)	Temperature (K)	Reference	Comment
22.46 ± 0.045	329.05	McCullough J.P., 1959	Please also see Spitzer R., 1946.; GT
24.38 ± 0.20	353.
25.85 ± 0.20	372.
28.03 ± 0.30	395.
27.985 ± 0.055	395.05
30.19 ± 0.30	424.
33.16 ± 0.30	463.
33.334 ± 0.067	463.10
36.02 ± 0.40	503.
38.26 ± 0.40	539.

References

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McCullough, Pennington, et al., 1959
McCullough, J.P.; Pennington, R.E.; Smith, J.C.; Hossenlopp, I.A.; Waddington, G., Thermodynamics of cyclopentane, methylcyclopentane and 1,cis-3-dimethylcyclopentane: Verification of the concept of pseudorotation, J. Am. Chem. Soc., 1959, 81, 5880-5883. [all data]

Spitzer and Huffman, 1947
Spitzer, R.; Huffman, H.M., The heats of combustion of cyclopentane, cyclohexane, cycloheptane and cyclooctane, J. Am. Chem. Soc., 1947, 69, 211-213. [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]

Dorofeeva O.V., 1986
Dorofeeva O.V., Thermodynamic properties of twenty-one monocyclic hydrocarbons, J. Phys. Chem. Ref. Data, 1986, 15, 437-464. [all data]

Kilpatrick J.E., 1947
Kilpatrick J.E., The thermodynamics and molecular structure of cyclopentane, J. Am. Chem. Soc., 1947, 69, 2483-2488. [all data]

McCullough J.P., 1959
McCullough J.P., Thermodynamics of cyclopentane, methylcyclopentane and 1,cis-3-dimethylcyclopentane: verification of the concept of pseudorotation, J. Am. Chem. Soc., 1959, 81, 5880-5883. [all data]

Sundaram S., 1963
Sundaram S., Thermodynamic functions of some propellants, Z. Phys. Chem. (Frankfurt), 1963, 36, 376-377. [all data]

Spitzer R., 1946
Spitzer R., The heat capacity of gaseous cyclopentane, cyclohexane and methylcyclohexane, J. Am. Chem. Soc., 1946, 68, 2537-2538. [all data]

Notes

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Symbols used in this document:

C_p,gas Constant pressure heat capacity of gas

Δ_fH°_gas Enthalpy of formation of gas at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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C_p,gas	Constant pressure heat capacity of gas
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions