Calculated and Experimental Enthalpies vap H and vap H exp of Download Table A) b) ln((p2) (p1)) = ( Hvap) (R)((1) (T1) ( 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 Enthalpy of vaporization Wikipedia Law of Equipartition of Energy Energy is equally distributed among all degrees of freedom Each degree contributes kT per molecule Translational, rotational,