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Related Topics:Octane
For other uses, see Octane (disambiguation).
| Octane | |
|---|---|
| General | |
| Molecular formula | C8H18 |
| SMILES | CCCCCCCC |
| Molar mass | 114.22 g/mol |
| Appearance | colorless liquid |
| CAS number | * |
| Properties | |
| Density and phase | 0.703 g/ml, liquid |
| Solubility in water | Immiscible |
| Melting point | −57 °C (216 K) |
| Boiling point | 125.5 °C (398.7 K) |
| Viscosity | 0.542 cP at 20 °C |
| Thermodynamic data | |
| Std enthalpy change of formation, ΔfH | −250 kJ/mol |
| Std enthalpy change of combustion, ΔcH | −5430 kJ/mol |
| Standard molar entropy, S | 360 J·K−1·mol−1 |
| Hazards | |
| MSDS | External MSDS |
| EU classification | Flammable (F) Harmful (Xn) Dangerous for the environment (N) |
| NFPA 704 | |
| R-phrases | , , , , |
| S-phrases | , , , , , , , |
| Flash point | 13 °C |
| Autoignition temperature | 220 °C |
| Explosive limits | 1.0–6.5% |
| RTECS number | RG8400000 |
| Supplementary data page | |
| Structure and properties | n, εr, etc. |
| Thermodynamic data | Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Related alkanes | Heptane 2,2,4-Trimethylpentane |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Chemical infobox | |
Octane is an alkane with the chemical formula C8H18. It has 18 isomers.
One of the isomers, 2,2,4-trimethylpentane or isooctane, is of major importance, as it has been selected as the 100 point on the octane rating scale, with n-heptane as the zero point. Octane ratings are ratings used to represent the anti-knock performance of petroleum-based fuels (octane is less likely to prematurely combust under pressure than heptane), given as the percentage of 2,2,4-trimethylpentane in an 2,2,4-trimethylpentane / n-heptane mixture that would have the same performance. It is an important constituent of gasoline.
Octane has 18 isomers :
- Octane (n-octane)
- 2-Methylheptane
- 3-Methylheptane
- 4-Methylheptane
- 3-Ethylhexane
- 2,2-Dimethylhexane
- 2,3-Dimethylhexane
- 2,4-Dimethylhexane
- 2,5-Dimethylhexane
- 3,3-Dimethylhexane
- 3,4-Dimethylhexane
- 2-Methyl-3-ethylpentane
- 3-Methyl-3-ethylpentane
- 2,2,3-Trimethylpentane
- 2,2,4-Trimethylpentane (isooctane)
- 2,3,3-Trimethylpentane
- 2,3,4-Trimethylpentane
- 2,2,3,3-Tetramethylbutane
External links
- International Chemical Safety Card 0933 (n-octane)
- International Chemical Safety Card 0731 (2-methylheptane)
- NIOSH Pocket Guide to Chemical Hazards
- Material Safety Data Sheet for Octane
- Phytochemical database entry
أوكتان | N-Oktan | Octano | Oktano | Octane | Octaan | オクタン | Oktan | Октан | Oktaani (kemia) | Oktan | Oktan
"Octane"