Vapour Pressure vs 1 T Delta Hvap Clausius Chegg.com Vaporization enthalpy of isooctane (2,2,4 trimethylpentane). The fitted Download Scientific Diagram Finding Delta H using ln P vs 1 T (Hvap Lab) Hvap for water is 40.7 KJ `mol^(1)` . The entropy of vaporization of water is: Heats of Vaporization and Condensation Examples, Calculations and Definitions CK 12 Foundation If \Delta {H}{vap }^{\circ} for {H}{2} {O} is 44 {kJ} {mol}^{ 1}, then amount of heat required to evaporate 9 {~g} of {H}_{2} {O} is :