Change in enthalpy of substance x is 300 j gm at its boiling point 300k then molar entropy change for Brainly.in Solved: H v a p for water is 40.7 KJ mol 1 . The entropy of vapo [Chemistry] 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 The enthalpies of vaporization at 25C ( H vap at 25C; kJ mol 1), Download Scientific Diagram phase changes.svg Delta Vap H Latent Heat of Vaporization Delta Hvap of Water calculated by corresponding states correlation in a one cell excel formula