Enthalpy of vaporization Wikipedia File:Heat of Vaporization Water.png Wikimedia Commons 5.4: Vapor Pressure Chemistry LibreTexts Delta H^0 vap of water is +40.79 kJ mol at 1 bar and 100 deg C. Change in internal energy for this__ 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 Properties of Liquids