Pentane
- Formula: C5H12
- Molecular weight: 72.1488
- IUPAC Standard InChI: InChI=1S/C5H12/c1-3-5-4-2/h3-5H2,1-2H3
- IUPAC Standard InChIKey: OFBQJSOFQDEBGM-UHFFFAOYSA-N
- CAS Registry Number: 109-66-0
- 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: n-Pentane; Skellysolve A; n-C5H12; Pentan; Pentanen; Pentani; Amyl hydride; NSC 72415
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Condensed 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
DH - Eugene S. Domalski and Elizabeth D. Hearing
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -173.5 ± 0.59 | kJ/mol | Ccb | Good, 1970 | ALS |
| ΔfH°liquid | -173.1 ± 0.67 | kJ/mol | Ccb | Prosen and Rossini, 1945 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°liquid | -3509.0 ± 0.46 | kJ/mol | Ccb | Good, 1970 | Corresponding ΔfHºliquid = -173.5 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
| ΔcH°liquid | -3509.5 ± 0.59 | kJ/mol | Ccb | Prosen and Rossini, 1945 | Corresponding ΔfHºliquid = -173.0 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
| ΔcH°liquid | -3509.2 ± 0.75 | kJ/mol | Ccb | Prosen and Rossini, 1944 | Corresponding ΔfHºliquid = -173.4 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid | 263.47 | J/mol*K | N/A | Messerly, Guthrie, et al., 1967 | DH |
| S°liquid | 262.67 | J/mol*K | N/A | Messerly and Kennedy, 1940 | DH |
| S°liquid | 259.4 | J/mol*K | N/A | Parks and Huffman, 1930 | Extrapolation below 90 K, 56.61 J/mol*K.; DH |
Constant pressure heat capacity of liquid
| Cp,liquid (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 168.6 | 298. | Grigor'ev, Rastorguev, et al., 1975 | T = 300 to 463 K.; DH |
| 167.19 | 298.15 | Messerly, Guthrie, et al., 1967 | T = 12 to 300 K.; DH |
| 167.99 | 290. | Messerly and Kennedy, 1940 | T = 12 to 290 K.; DH |
| 163.2 | 290.0 | Parks and Huffman, 1930 | T = 93 to 290 K. Value is unsmoothed experimental datum.; DH |
References
Go To: Top, Condensed phase thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Good, 1970
Good, W.D.,
The enthalpies of combustion and formation of the isomeric pentanes,
J. Chem. Thermodyn., 1970, 2, 237-244. [all data]
Prosen and Rossini, 1945
Prosen, E.J.; Rossini, F.D.,
Heats of combustion and formation of the paraffin hydrocarbons at 25° C,
J. Res. NBS, 1945, 263-267. [all data]
Prosen and Rossini, 1944
Prosen, E.J.; Rossini, F.D.,
Heats of combustion of eight normal paraffin hydrocarbons in the liquid state,
J. Res. NBS, 1944, 33, 255-272. [all data]
Messerly, Guthrie, et al., 1967
Messerly, J.F.; Guthrie, G.B.; Todd, S.S.; Finke, H.L.,
Low-temperature thermal data for n-pentane, n-heptadecane, and n-octadecane,
J. Chem. Eng. Data, 1967, 12, 338-346. [all data]
Messerly and Kennedy, 1940
Messerly, G.H.; Kennedy, R.M.,
The heat capacity and entropy, heats of fusion and vaporization and the vapor pressure of n-pentane,
J. Am. Chem. Soc., 1940, 62, 2988-2991. [all data]
Parks and Huffman, 1930
Parks, G.S.; Huffman, H.M.,
Thermal data on organic compounds. IX. A study of the effect of unsaturation on the heat capacities, entropies and free energies of some hydrocarbons and other compounds,
J. Am. Chem. Soc., 1930, 52, 4381-4391. [all data]
Grigor'ev, Rastorguev, et al., 1975
Grigor'ev, B.A.; Rastorguev, Yu.L.; Yanin, G.S.,
Experimental determination of the isobaric specific heat of n-alkanes,
Iz. Vyssh. Uchebn. Zaved. Neft Gaz 18, 1975, No.10, 63-66. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, References
- Symbols used in this document:
Cp,liquid Constant pressure heat capacity of liquid S°liquid Entropy of liquid at standard conditions ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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