2,5-Dimethylhexane
2,5-Dimethylhexane is a branched alkane used in the aviation industry in low revolutions per minute helicopters. As an isomer of octane, the boiling point is very close to that of octane, but can in pure form be slightly lower. 2,5-Dimethylhexane is moderately toxic.
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| Names | |
|---|---|
| IUPAC name
2,5-Dimethylhexane[1] | |
| Identifiers | |
3D model (JSmol) |
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| 1696877 | |
| ChemSpider | |
| ECHA InfoCard | 100.008.861 |
| EC Number |
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PubChem CID |
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| UNII | |
| UN number | 3295 |
CompTox Dashboard (EPA) |
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| Properties | |
| C8H18 | |
| Molar mass | 114.232 g·mol−1 |
| Appearance | Colourless liquid |
| Odor | Odourless |
| Density | 694 mg mL−1 |
| Melting point | −93 to −89 °C; −136 to −128 °F; 180 to 184 K |
| Boiling point | 108.1 to 109.9 °C; 226.5 to 229.7 °F; 381.2 to 383.0 K |
| Vapor pressure | 7.582 kPa (at 37.7 °C) |
Henry's law constant (kH) |
3.0 nmol Pa−1 kg−1 |
| -98.15·10−6 cm3/mol | |
Refractive index (nD) |
1.392 |
| Thermochemistry | |
Heat capacity (C) |
249.20 J K−1 mol−1 |
Std enthalpy of formation (ΔfH⦵298) |
−262.0–−259.0 kJ mol−1 |
Std enthalpy of combustion (ΔcH⦵298) |
−5.4615–−5.4587 MJ mol−1 |
| Hazards | |
| GHS pictograms |     |
| GHS Signal word | Danger |
GHS hazard statements |
H225, H304, H315, H336, H410 |
| P210, P261, P273, P301+310, P331 | |
| Flash point | 26 °C (79 °F; 299 K) |
| Explosive limits | 0.98–?% |
| 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 | |
References
- "2,5-DIMETHYLHEXANE - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 26 March 2005. Identification and Related Records. Retrieved 12 March 2012.
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