mollier diagram luleå university of technology. Have you found yourself wondering: what is vapor pressure? the mollier diagram and the psychrometric chart. To calculate vapor pressure, use the Clausius-Clapeyron equation, which includes the variables for the enthalpy of the liquid, the real gas constant, the starting and final temperatures, and the starting and final vapor pressures. Through the formula we find that the change in enthalpy is 10.5 joules. The specific enthalpy of evaporation can be calculated from: he = hg - hf (4), he = specific evaporation enthalpy (kJ/kg). The pressure of this reaction mus be constant for the formula to work. H = enthalpy (kJ) m = mass (kg) h = specific enthalpy (kJ/kg) Specific Enthalpy. To find the enthalpy change for expanding one mole of water vapor at 100 C from 1 atm to the sublimation pressure, we use the virial equation and tabulated coefficients for water vapor to calculate ( ∂ H / ∂ P) 398 K. We find Δ H ( B ∗ → C) = 220 J m o l − 1. This is typically in the form of heat, but also a form of volume and pressure. If you're not sure what vapor pressure is, keep scrolling and you'll find the vapor pressure definition, five different vapor pressure … This online chemical calculator is based on the Clausius Clapeyron Equation. °C 0.115 atm -8. 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