Calculated and Experimental Enthalpies vap H and vap H exp of Download Table Hvap for water is 40.7 KJ `mol^(1)` . The entropy of vaporization of water is: Standard enthalpy of vaporisation \Delta _ { v a p } H ^ { \circ } for a .. Latent Heat of Vaporization Delta Hvap of Water calculated by corresponding states correlation in a one cell excel formula Chem Eng Musings Video answer for \Delta_{\text {vap }} \mathrm{H}^{\Theta} for water is +40.79 \mathrm{kJ} \mathrm{mol}^{ 1} at 1 bar and 100^{\circ} \mathrm{C}. Change in internal energy for this vapourisation under PPT For all phase changes the sign of S and H is always going to be the same PowerPoint Presentation ID:5755390