a) Show that the value of \Delta H for the adiabatic expansion of a perf.. Delta Vap H Latent Heat of Vaporization Delta Hvap of Water calculated by corresponding states correlation in a one cell excel formula The enthalpies of vaporization at 25C ( H vap at 25C; kJ mol 1), Download Scientific Diagram Solved: H v a p for water is 40.7 KJ mol 1 . The entropy of vapo [Chemistry] Delta S` for vapouization of 900g water (in KJ K ) is `Delta H_(Vap)=40KJ(mol)^ 1 `