Octane is an organic compound with the chemical formula C
8H
18. It is an alkane with eight carbon atoms. It is commonly used in fuel. It is the most important part of gasoline, because it is the part that lets out most of the energy that comes from gasoline when it is burned. A high octane fuel will be better than a low octane fuel.
Quick facts Names, Identifiers ...
Octane
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| Names |
| IUPAC name
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| Identifiers |
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3D model (JSmol) |
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| 3DMet |
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| Beilstein Reference |
1696875 |
| ChEBI |
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| ChEMBL |
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| ChemSpider |
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| DrugBank |
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| ECHA InfoCard |
100.003.539 |
| EC Number |
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| Gmelin Reference |
82412 |
| KEGG |
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| MeSH |
octane |
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| RTECS number |
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| UN number |
1262 |
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| Properties |
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C8H18 |
| Molar mass |
114.23 g·mol−1 |
| Appearance |
Colorless liquid |
| Odor |
Gasoline-like[2] |
| Density |
0.703 g cm−3 |
| Melting point |
−57.1 to −56.6 °C; −70.9 to −69.8 °F; 216.0 to 216.6 K |
| Boiling point |
125.1 to 126.1 °C; 257.1 to 258.9 °F; 398.2 to 399.2 K |
|
0.007 mg dm−3 (at 20 °C) |
| log P |
4.783 |
| Vapor pressure |
1.47 kPa (at 20.0 °C) |
| kH |
29 nmol Pa−1 kg−1 |
| Conjugate acid |
Octonium |
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-96.63·10−6 cm3/mol |
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1.398 |
| Viscosity |
542 μPa s (at 20 °C) |
| Thermochemistry |
Std enthalpy of
formation ΔfHo298 |
−252.1–−248.5 kJ mol−1 |
Std enthalpy of
combustion ΔcHo298 |
−5.53–−5.33 MJ mol−1 |
Standard molar
entropy So298 |
361.20 J K−1 mol−1 |
| Specific heat capacity, C |
255.68 J K−1 mol−1 |
| Hazards |
| NFPA 704 |
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| Explosive limits |
0.96–6.5% |
U.S. Permissible
exposure limit (PEL) |
TWA 500 ppm (2350 mg/m3)[2] |
| Related compounds |
| Related {{{label}}} |
{{{value}}} |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
| N verify (what is YN ?) |
| Infobox references |
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