Heat of Vaporization from Vapor Pressure (Example) Latent Heat of Vaporization Delta Hvap of Water calculated by corresponding states correlation in a one cell excel formula Chem Eng Musings Solved what is the delta H vap a liquid? how do you figure Chegg.com The internal energy change (in J) when 90 g of water undergoes complete evaporation at `100^(@)C ` is ______ . (Given : `Delta H_("vap")` for water at 373 K = 41 kJ mol , `R = 8.314 JK^( 1) mol^( 1)`) 3. Using the approximate form of the Clausius Clapeyron