Clausius-Clapeyron VaporChemistry
Clausius-Clapeyron Vapor Pressure & Heat of Vaporization Calculator
Calculate temperature-dependent saturation vapor pressure (P2), boiling point shifts, and molar enthalpy of vaporization (ΔHvap) via the two-point Clausius-Clapeyron equation.
Calculated Result
Target Vapor Pressure (P2)
0pressure unit
Calculator Inputs
pressure
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kJ/mol
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Quick select:
Target Vapor Pressure (P2)
0pressure unit
Vapor Pressure Multiplier (P2 / P1)
0 x
Clausius-Clapeyron Vapor Pressure Escalation
Initial P1
760 -(100%)
Target P2
0 -(0%)
Standard chemical thermodynamics and phase equilibria tool for liquid-vapor phase coexistence.
Calculation Methodology
Two-Point Clausius-Clapeyron Equation: ln(P2 / P1) = (ΔHvap / R) * [ (1 / T1) - (1 / T2) ]. Rearranged: P2 = P1 * exp( (ΔHvap / R) * [ (T2 - T1) / (T1 * T2) ] ). Gas constant R = 8.314 J/(mol K); T in Kelvin.
Frequently Asked Questions
It assumes the molar volume of the liquid is negligible compared to the vapor, the vapor behaves as an ideal gas, and the enthalpy of vaporization ΔHvap is invariant over the temperature range.
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