Hexadecane
"Cetane" redirects here. For the diesel fuel analysis, see cetane number.
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| Names | |
|---|---|
| IUPAC name
Hexadecane[1] | |
| Identifiers | |
544-76-3  | |
| 1736592 | |
| ChEBI | CHEBI:45296 |
| ChEMBL | ChEMBL134994 |
| ChemSpider | 10540 |
| EC Number | 208-878-9 |
| 103739 | |
| Jmol interactive 3D | Image |
| MeSH | n-hexadecane |
| PubChem | 11006 |
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| Properties | |
| C16H34 | |
| Molar mass | 226.45 g·mol−1 |
| Appearance | Colourless liquid |
| Odor | Gasoline-like to odorless |
| Density | 0.77 g/cm3[2] |
| Melting point | 18 °C (64 °F; 291 K)[2] |
| Boiling point | 287 °C (549 °F; 560 K)[2] |
| log P | 8.859 |
| Vapor pressure | < 0.1 mbar (20 °C) |
| Henry's law constant (kH) |
43 nmol Pa−1 kg−1 |
| Refractive index (nD) |
1.434 |
| Thermochemistry | |
| 499.72 J K−1 mol−1 or 2.21 J K−1 g−1 | |
| Std molar entropy (S |
586.18 J K−1 mol−1 |
| Std enthalpy of formation (ΔfH |
−458.3–−454.3 kJ mol−1 |
| Std enthalpy of combustion (ΔcH |
−10.7009–−10.6973 MJ mol−1 |
| Hazards | |
| GHS pictograms |  |
| GHS signal word | WARNING |
| H315 | |
| EU classification (DSD) |
 Xi |
| R-phrases | R38 |
| Flash point | 135 °C (275 °F; 408 K)[2] |
| 215 °C (419 °F; 488 K)[2] | |
| Related compounds | |
| Related alkanes |
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| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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| Infobox references | |
Hexadecane (also called cetane) is an alkane hydrocarbon with the chemical formula C16H34. Hexadecane consists of a chain of 16 carbon atoms, with three hydrogen atoms bonded to the two end carbon atoms, and two hydrogens bonded to each of the 14 other carbon atoms.
Cetane is often used as a shorthand for cetane number, a measure of the detonation of diesel fuel. Cetane ignites very easily under compression; for this reason, it is assigned a cetane number of 100, and serves as a reference for other fuel mixtures.
It has one of the lowest octane ratings, at <−30.[3]
See also
References
External links
- Vapor pressure and liquid density calculation
- Technique to determine hexadecane transfer
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