Heptane
Heptane is an organic compound with the chemical formula C7H16. It is an alkane with seven carbon atoms. It is used in fuels and is in gasoline.
| Names | |
|---|---|
| IUPAC name
Heptane[2]
| |
| Other names
Septane[1]
| |
| Identifiers | |
| CAS number | |
| PubChem | |
| EC number | 205-563-8 |
| MeSH | |
| ChEBI | CHEBI:43098 |
| RTECS number | MI7700000 |
| SMILES | CCCCCCC |
| Beilstein Reference | 1730763 |
| Gmelin Reference | 49760 |
| Properties | |
| Molecular formula | C7H16 |
| Molar mass | 100.2 g mol-1 |
| Appearance | Colourless liquid |
| Odor | Petrolic |
| Density | 0.6795 g cm−3[3] |
| Melting point |
-90.549[3] °C, Expression error: Unrecognized punctuation character "". K, Expression error: Unrecognized punctuation character "". °F |
| Boiling point | |
| Solubility in water | 0.0003% (20 °C)[4] |
| log P | 4.274 |
| Vapor pressure | 5.33 kPa (at 20.0 °C) |
| kH | 12 nmol Pa−1 kg−1 |
| -85.24·10−6 cm3/mol | |
| Refractive index (nD) | 1.3855[3] |
| Viscosity | 0.386 mPa·s |
| Dipole moment | 0.0 D |
| Thermochemistry | |
| Std enthalpy of formation ΔfH |
−225.2–−223.6 kJ mol−1 |
| Std enthalpy of combustion ΔcH |
−4.825–−4.809 MJ mol−1 |
| Standard molar entropy S |
328.57 J K−1 mol−1 |
| Specific heat capacity, C | 224.64 J K−1 mol−1 |
| Hazards | |
| NFPA 704 |
3
1
0
|
| Explosive limits | 1.05–6.7% |
| U.S. Permissible exposure limit (PEL) |
TWA 500 ppm (2000 mg/m3)[4] |
References
- ↑ Hofmann, August Wilhelm Von. I. On the action of trichloride of phosphorus on the salts of the aromatic monamines. Proceedings of the Royal Society of London 15 (1 January 1867). p. 54–62. doi:10.1098/rspl.1866.0018. Retrieved 3 April 2018.
- ↑ n-heptane – Compound Summary. PubChem Compound (16 September 2004). USA: National Center for Biotechnology Information. Retrieved 2 January 2012.
- ↑ 3.0 3.1 3.2 3.3 CRC Handbook of Chemistry and Physics (2011). Boca Raton, FL: CRC Press. p. 3.290. ISBN 1439855110.
- ↑ 4.0 4.1 NIOSH Pocket Guide to Chemical Hazards. #0312National Institute for Occupational Safety and Health (NIOSH).