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| Pentane | |
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Pentane | |
| Other names | Quintane |
| Identifiers | |
| CAS number | |
| PubChem | |
| EC number | 203-692-4 |
| DrugBank | DB03119 |
| MeSH | |
| ChEBI | CHEBI:37830 |
| RTECS number | RZ9450000 |
| SMILES | CCCCC |
| Beilstein Reference | 969132 |
| Gmelin Reference | 1766 |
| Properties | |
| Molecular formula | C5H12 |
| Molar mass | 72.15 g mol-1 |
| Appearance | Colourless liquid |
| Odor | Gasoline-like |
| Density | 0.626 g mL−1; 0.6262 g mL−1 (at 20 °C) |
| Melting point | Expression error: Unrecognized word "to". °C, 142.7 to 144.1 K, Expression error: Unrecognized word "to". °F |
| Boiling point | |
| Solubility in water | 40 mg L−1 (at 20 °C) |
| log P | 3.255 |
| Vapor pressure | 57.90 kPa (at 20.0 °C) |
| kH | 7.8 nmol Pa−1 kg−1 |
| Acidity (pKa) | ~45 |
| Basicity (pKb) | ~59 |
| λmax | 200 nm |
| -63.05·10−6 cm3/mol | |
| Refractive index (nD) | 1.358 |
| Viscosity | 0.240 mPa·s (at 20 °C) |
| Thermochemistry | |
| Std enthalpy of formation ΔfH | −174.1–−172.9 kJ mol−1 |
| Std enthalpy of combustion ΔcH | −3.5095–−3.5085 MJ mol−1 |
| Standard molar entropy S | 263.47 J K−1 mol−1 |
| Specific heat capacity, C | 167.19 J K−1 mol−1 |
| Hazards | |
| NFPA 704 |
4 1 0 |
| Explosive limits | 1.5–7.8% |
| U.S. Permissible exposure limit (PEL) | TWA 1000 ppm (2950 mg/m3) |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Pentane is an organic compound with the chemical formula of C5H12. It is an alkane with five carbon atoms. Usually, "pentane" represents all three isomers (n-pentane, isopentane and neopentane). But in the IUPAC, pentane only represents n-pentane. In the IUPAC, the other two isomers is 2-methylbutane and 2,2-dimethylpropane. Cyclopentane's chemical formula is C5H10, so it is not an isomer of pentane. view more...
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