Physical Properties
The boiling points of the various hexanes are somewhat similar and, as for other alkanes, are generally lower for the more branched forms. The melting points are quite different and the trend is not apparent.
| Isomer | M.P. (°C) | B.P. (°C) |
|---|---|---|
| n-hexane | −95.3 | 68.7 |
| 3-methylpentane | −118.0 | 63.3 |
| 2-methylpentane (isohexane) | −153.7 | 60.3 |
| 2,3-dimethylbutane | −128.6 | 58.0 |
| 2,2-dimethylbutane (neohexane) | −99.8 | 49.7 |
Normal hexane has considerable vapor pressure at room temperature:
| Temperature (°C) | Vapor pressure (mmHg) |
|---|---|
| −40 | 3.36 |
| −30 | 7.12 |
| −20 | 14.01 |
| −10 | 25.91 |
| 0 | 45.37 |
| 10 | 75.74 |
| 20 | 121.26 |
| 25 | 151.28 |
| 30 | 187.11 |
| 40 | 279.42 |
| 50 | 405.31 |
| 60 | 572.76 |
Read more about this topic: Hexane
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