Heptane, 2,2-dimethyl-
- Formula: C9H20
- Molecular weight: 128.2551
- IUPAC Standard InChIKey: PSABUFWDVWCFDP-UHFFFAOYSA-N
- CAS Registry Number: 1071-26-7
- 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: 2,2-Dimethylheptane
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Phase change data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Donald R. Burgess, Jr.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | -246.1 | kJ/mol | N/A | Good, 1969 | Value computed using ΔfHliquid° value of -288.2±1 kj/mol from Good, 1969 and ΔvapH° value of 42.1 kj/mol from missing citation. |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change data, References, Notes
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 | -288.2 ± 1.0 | kJ/mol | Ccr | Good, 1969 | |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°liquid | -6111.74 ± 0.84 | kJ/mol | Ccr | Good, 1969 | Corresponding ΔfHºliquid = -288.2 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 |
---|---|---|---|---|---|
Tboil | 405. ± 3. | K | AVG | N/A | Average of 11 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 160.0 ± 0.2 | K | AVG | N/A | Average of 11 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 576.7 ± 0.5 | K | N/A | Daubert, 1996 | |
Tc | 576.69 | K | N/A | Kay and Hissong, 1969 | Uncertainty assigned by TRC = 0.5 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 23.5 ± 0.4 | bar | N/A | Daubert, 1996 | |
Pc | 23.50 | bar | N/A | Kay and Hissong, 1969 | Uncertainty assigned by TRC = 0.4137 bar; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 42.3 | kJ/mol | N/A | Reid, 1972 | See also Labbauf, Greenshields, et al., 1961.; AC |
References
Go To: Top, Gas phase thermochemistry data, 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.
Good, 1969
Good, W.D.,
Enthalpies of combustion and formation of 11 isomeric nonanes,
J. Chem. Eng. Data, 1969, 14, 231-235. [all data]
Daubert, 1996
Daubert, T.E.,
Vapor-Liquid Critical Properties of Elements and Compounds. 5. Branched Alkanes and Cycloalkanes,
J. Chem. Eng. Data, 1996, 41, 365-372. [all data]
Kay and Hissong, 1969
Kay, W.B.; Hissong, D.W.,
The Critical Properties of Hydrocarbon Mixtures constants,
Proc. - Am. Pet. Inst., Div. Refin., 1969, 49, 13. [all data]
Reid, 1972
Reid, Robert C.,
Handbook on vapor pressure and heats of vaporization of hydrocarbons and related compounds, R. C. Wilhort and B. J. Zwolinski, Texas A Research Foundation. College Station, Texas(1971). 329 pages.$10.00,
AIChE J., 1972, 18, 6, 1278-1278, https://doi.org/10.1002/aic.690180637
. [all data]
Labbauf, Greenshields, et al., 1961
Labbauf, A.; Greenshields, J.B.; Rossini, F.D.,
Heats of formation, combustion, and vaporization of the 35 nonanes and 75 decanes,
J. Chem. Eng. Data, 1961, 6, 261-263. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, References
- Symbols used in this document:
Pc Critical pressure Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔvapH° Enthalpy of vaporization at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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