Isobutane (data Page) - Thermodynamic Properties

Thermodynamic Properties

Phase behavior
Triple point 113.55K (–159.6 °C), 0.019481 Pa
Critical point 407.7 K (134.6 °C), 3650 kPa
Std enthalpy change
of fusion, ΔfusHo		 4.54 kJ/mol
Std entropy change
of fusion, ΔfusSo		 39.92 J/(mol·K)
Std enthalpy change
of vaporization, ΔvapHo		 21.3 kJ/mol
Std entropy change
of vaporization, ΔvapSo		 81.46 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		 ? kJ/mol
Standard molar entropy,
Soliquid		 200.79 J/(mol K)
Heat capacity, cp 129.70 J/(mol K) –253°C to –13°C
Gas properties
Std enthalpy change
of formation, ΔfHogas		 –134.2 kJ/mol
Standard molar entropy,
Sogas		 249.7 J/(mol K)
Enthalpy of combustion, ΔcHo –2869 kJ/mol
Heat capacity, cp 95.21 J/(mol K) at 20°C
van der Waals' constants a = 13.041 L2 kPa/mol2
b = 0.1142 liter per mole

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