Alcohol · C₂H₆O
Ethyl alcohol — a solvent, fuel, and fermentation product. Fuel blending, solvents, sanitizers, and a classic distillation example (the ethanol–water azeotrope).
| Formula | C₂H₆O |
| CAS number | 64-17-5 |
| Synonyms | ethyl alcohol, grain alcohol, EtOH |
| Molar mass | 46.07 g/mol (Computed from the molecular formula and CODATA atomic weights) |
| Normal boiling point | 78.37 °C (NIST Chemistry WebBook (webbook.nist.gov)) |
| Liquid density | 789 kg/m³ (Reference liquid density near 20–25 °C (NIST WebBook)) |
Antoine equation (mmHg/°C): log₁₀(P) = 8.20417 − 1642.89 / (230.3 + T), valid -57–80 °C. Source: NIST Chemistry WebBook (webbook.nist.gov).
| °C | kPa | bar | mmHg | psia |
|---|---|---|---|---|
| -57.0 | 0.01 | 0.0001 | 0.1 | 0.001 |
| -29.6 | 0.14 | 0.0014 | 1.0 | 0.020 |
| -2.2 | 1.34 | 0.0134 | 10.0 | 0.194 |
| 25.2 | 7.92 | 0.0792 | 59.4 | 1.149 |
| 52.6 | 33.25 | 0.3325 | 249.4 | 4.822 |
| 80.0 | 108.28 | 1.0828 | 812.2 | 15.705 |
Using its Antoine constants (NIST Chemistry WebBook (webbook.nist.gov)), the saturation pressure of ethanol at 25 °C is about 7.83 kPa. Use the calculator above for any temperature within -57–80 °C.
Ethanol boils at 78.37 °C at atmospheric pressure (NIST Chemistry WebBook (webbook.nist.gov)). At that temperature its vapor pressure equals one atmosphere (760 mmHg).
Ethanol (C₂H₆O, CAS 64-17-5) has a molar mass of 46.07 g/mol.