Alkane · C₅H₁₂
A light, highly volatile alkane — a blowing agent and blendstock. Foam blowing agent, natural-gasoline component, and a low-boiling solvent.
| Formula | C₅H₁₂ |
| CAS number | 109-66-0 |
| Synonyms | pentane |
| Molar mass | 72.15 g/mol (Computed from the molecular formula and CODATA atomic weights) |
| Normal boiling point | 36.06 °C (NIST Chemistry WebBook (webbook.nist.gov)) |
| Liquid density | 626 kg/m³ (Reference liquid density near 20–25 °C (NIST WebBook)) |
Antoine equation (mmHg/°C): log₁₀(P) = 6.87632 − 1075.78 / (233.205 + T), valid -50–58 °C. Source: NIST Chemistry WebBook (webbook.nist.gov).
| °C | kPa | bar | mmHg | psia |
|---|---|---|---|---|
| -50.0 | 1.35 | 0.0135 | 10.1 | 0.195 |
| -28.4 | 5.60 | 0.0560 | 42.0 | 0.813 |
| -6.8 | 17.77 | 0.1777 | 133.3 | 2.577 |
| 14.8 | 46.08 | 0.4608 | 345.6 | 6.683 |
| 36.4 | 102.57 | 1.0257 | 769.3 | 14.876 |
| 58.0 | 202.76 | 2.0276 | 1520.8 | 29.408 |
Using its Antoine constants (NIST Chemistry WebBook (webbook.nist.gov)), the saturation pressure of n-pentane at 25 °C is about 68.37 kPa. Use the calculator above for any temperature within -50–58 °C.
n-Pentane boils at 36.06 °C at atmospheric pressure (NIST Chemistry WebBook (webbook.nist.gov)). At that temperature its vapor pressure equals one atmosphere (760 mmHg).
n-Pentane (C₅H₁₂, CAS 109-66-0) has a molar mass of 72.15 g/mol.