Formic Acid (data Page) - Thermodynamic Properties

Thermodynamic Properties

Phase behavior
Triple point 281.40 K (8.25 °C), 2.2 kPa
Critical point 588 K (315 °C), 5.81 MPa
Std enthalpy change
of fusion, ΔfusHo		 +12.68 kJ/mol
Std entropy change
of fusion, ΔfusSo		 +45.05 J/(mol·K) at 8.25 °C
Std enthalpy change
of vaporization, ΔvapHo		 +23.1 kJ/mol
Std entropy change
of vaporization, ΔvapSo		 +61.8 J/(mol·K)
Solid properties
Std enthalpy change
of formation, ΔfHosolid		 ? kJ/mol
Standard molar entropy,
Sosolid		 ? J/(mol K)
Heat capacity, cp 74.5 J/(mol K) at –22 °C
82.8 J/(mol K) at 0 °C
Liquid properties
Std enthalpy change
of formation, ΔfHoliquid		 –425.5 kJ/mol
Standard molar entropy,
Soliquid		 129.0 J/(mol K)
Enthalpy of combustion, ΔcHo –254.6 kJ/mol
Heat capacity, cp 101.3 J/(mol K) at 20°C-100°C
Gas properties
Std enthalpy change
of formation, ΔfHogas		 –362.6 kJ/mol
Standard molar entropy,
Sogas		 251.0 J/(mol K)
Heat capacity, cp 45.68 J/(mol K) at 25°C

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