Potential for natural evaporation as a reliable renewable energy resource Nature Communications For the vaporisation of water : `H_(2)O (I) hArr H_(2)O(g)` [1 atm. Pressure] Given : `Delta S = 120 JK^( 1)` and `Delta H =+45.0 kJ`. Evaluate the temperature at which liquid water As Enthalpy of vaporization of water at 100C is 40.63 kJ mol. Calculate .. 5) For vaporization of water at 1 bar, \Delta H = 40.63 \mathrm {kJ} \ma.. Specific Heat Capacity of Water: Temperature Dependent Data and Calculator