 | |
 | |
 | |
 | |
| Names | |
|---|---|
| IUPAC name
Octane | |
| Identifiers | |
3D model (JSmol) |
|
| 3DMet | |
| Beilstein Reference | 1696875 |
| ChEBI | |
| ChEMBL | |
| ChemSpider | |
| DrugBank | |
| ECHA InfoCard | 100.003.539 |
| EC Number |
|
| Gmelin Reference | 82412 |
| KEGG | |
| MeSH | octane |
PubChem CID |
|
| RTECS number |
|
| UN number | 1262 |
CompTox Dashboard (EPA) |
|
| |
| Properties | |
| C8H18 | |
| Molar mass | 114.23 g·mol−1 |
| Appearance | Colorless liquid |
| Odor | Gasoline-like |
| 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 |
| -96.63·10−6 cm3/mol | |
Refractive index (nD) |
1.398 |
| Viscosity | 542 μPa s (at 20 °C) |
| Thermochemistry | |
| Std enthalpy of formation ΔfH |
−252.1–−248.5 kJ mol−1 |
| Std enthalpy of combustion ΔcH |
−5.53–−5.33 MJ mol−1 |
| Standard molar entropy S |
361.20 J K−1 mol−1 |
| Specific heat capacity, C | 255.68 J K−1 mol−1 |
| Hazards | |
| GHS labelling: | |
    | |
| Danger | |
| H225, H304, H315, H336, H410 | |
| P210, P261, P273, P301+P310, P331 | |
| NFPA 704 (fire diamond) | |
| Flash point | 13.0 °C (55.4 °F; 286.1 K) |
| 220.0 °C (428.0 °F; 493.1 K) | |
| Explosive limits | 0.96–6.5% |
| Lethal dose or concentration (LD, LC): | |
LDLo (lowest published) |
428 mg/kg (mouse, intravenous) |
| NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 500 ppm (2350 mg/m3) |
REL (Recommended) |
TWA 75 ppm (350 mg/m3) C 385 ppm (1800 mg/m3) [15-minute] |
IDLH (Immediate danger) |
1000 ppm |
| Related compounds | |
Related alkanes |
|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is  ?) | |
| Infobox references | |
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.
