phase diagram water.svg phase changes.svg Entropy of vaporisation is given by the formula, \Delta S_{\text {vap. }}.. when do we use this two equation? is there a specific condition on when to use them ? : r ChemicalEngineering Enthalpy of vaporization Wikipedia 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