O-Xylene (data Page) - Thermodynamic Properties

Thermodynamic Properties

Phase behavior
Triple point 247.8 K (–25.3 °C), ? Pa
Critical point 631 K (358 °C), 3700 Pa
Std enthalpy change
of fusion, ΔfusHo		 13.6 kJ/mol
Std entropy change
of fusion, ΔfusSo		 54.87 J/(mol·K) at –25.3
Std enthalpy change
of vaporization, ΔvapHo		 36.24 kJ/mol at 144.5°C
Std entropy change
of vaporization, ΔvapSo		 ? J/(mol·K)
Solid properties
Std enthalpy change
of formation, ΔfHosolid		 ? kJ/mol
Standard molar entropy,
Sosolid		 ? J/(mol K)
Heat capacity, cp ? J/(mol K)
Liquid properties
Std enthalpy change
of formation, ΔfHoliquid		 –24.4 kJ/mol
Standard molar entropy,
Soliquid		 247 J/(mol K)
Enthalpy of combustion, ΔcHo –4552 kJ/mol
Heat capacity, cp 187.0 J/(mol K) at 25°C
Gas properties
Std enthalpy change
of formation, ΔfHogas		 19.0 kJ/mol
Standard molar entropy,
Sogas		 353.6 J/(mol K)
Heat capacity, cp 132.5 J/(mol K) at 25°C
van der Waals' constants a = 3038 L2 kPa/mol2
b = 0.1755 liter per mole

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