Calculated and Experimental Enthalpies vap H and vap H exp of Download Table The difference between `Delta`H and `Delta`U at constant volume is equal to Delta_{vap}H^ for water is +40.49 kJ moi^ 1 at 1 bar and 100C . Change in internal energy for this vaporization under same condition is Sarthaks eConnect Largest Online Education Community Delta Vap H Latent Heat of Vaporization Delta Hvap of Water calculated by corresponding states correlation Delta 8 1000mg Disposable Pineapple Express Hemplitude Standard enthalpy of vapourisation `Delta_("vap")H^( )` for water at `100^@C` is `40.66 kJ mol^( 1)`. The internal energy of vapourisation of water at `100^@C` (in kJ `mol^( 1)`) is (Assume water vapour to behave like