CHAPTER 8 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 Hvap for water is 40.7 KJ `mol^(1)` . The entropy of vaporization of water is: phase diagram water.svg Excess Enthalpy and Heat Capacity for an Ethanol Water Mixture Wolfram Demonstrations Project