Aromatic · C₈H₁₀
A xylene isomer — part of the mixed-xylenes aromatics stream. Feedstock for isophthalic acid; a component of mixed xylenes solvent and gasoline blending.
| Formula | C₈H₁₀ |
| CAS number | 108-38-3 |
| Synonyms | meta-xylene, 1,3-dimethylbenzene |
| Molar mass | 106.17 g/mol (Computed from the molecular formula and CODATA atomic weights) |
| Normal boiling point | 139.1 °C (NIST Chemistry WebBook (webbook.nist.gov)) |
| Liquid density | 864 kg/m³ (Reference liquid density near 20–25 °C (NIST WebBook)) |
Antoine equation (mmHg/°C): log₁₀(P) = 7.00908 − 1462.266 / (215.11 + T), valid 28–166 °C. Source: NIST Chemistry WebBook (webbook.nist.gov).
| °C | kPa | bar | mmHg | psia |
|---|---|---|---|---|
| 28.0 | 1.32 | 0.0132 | 9.9 | 0.191 |
| 55.6 | 5.40 | 0.0540 | 40.5 | 0.783 |
| 83.2 | 17.07 | 0.1707 | 128.0 | 2.475 |
| 110.8 | 44.39 | 0.4439 | 332.9 | 6.438 |
| 138.4 | 99.44 | 0.9944 | 745.9 | 14.423 |
| 166.0 | 198.21 | 1.9821 | 1486.7 | 28.748 |
Using its Antoine constants (NIST Chemistry WebBook (webbook.nist.gov)), the saturation pressure of m-xylene at 25 °C is about 1.11 kPa. Use the calculator above for any temperature within 28–166 °C.
m-Xylene boils at 139.1 °C at atmospheric pressure (NIST Chemistry WebBook (webbook.nist.gov)). At that temperature its vapor pressure equals one atmosphere (760 mmHg).
m-Xylene (C₈H₁₀, CAS 108-38-3) has a molar mass of 106.17 g/mol.