Vapor Pressure Heat of Vaporization: Clausius Clapeyron when do we use this two equation? is there a specific condition on when to use them ? : r ChemicalEngineering 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 A) b) ln((p2) (p1)) = ( Hvap) (R)((1) (T1) ( Enthalpy of vaporization Wikipedia