If \Delta {H}{vap }^{\circ} for {H}{2} {O} is 44 {kJ} {mol}^{ 1}, then amount of heat required to evaporate 9 {~g} of {H}_{2} {O} is : 3 Ways to Calculate Vapor Pressure wikiHow Hybrid Delta 8 Pen The enthalpy of vaporization of \mathrm{H}{2} \mathrm{O}(1) is x \mathrm{~kJ} \mathrm{mol} and enthalpy of formation of water vapour \mathrm{ykJ} \mathrm{mol}. Enthalpy of formation of 3. (a) Derive the integrated form of Clausius Clapeyron DeltaH` (vap) for water is `40.7 kJ mol^( 1)`. The entropy of vapourisation of water is