Standard enthalpy of vaporisation \Delta _ { v a p } H ^ { \circ } for a .. 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 10.3 Phase Transitions Chemistry Law of Equipartition of Energy Energy is equally distributed among all degrees of freedom Each degree contributes kT per molecule Translational, rotational, Delta Extrax Diamond Heights Disposable 3G D8 Gas Water Properties: Vaporization Heat vs. Temperature Charts and Calculator