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 THE ENTHALPY OF A SYSTEM Enthalpy (H) is the total heat content of a system, defined as its internal energy (E) plus the product of its pressure (P) and volume (V) (H = Heat of Vaporization: Clausius Clapeyron Solved: H v a p for water is 40.7 KJ mol 1 . The entropy of vapo [Chemistry] If Delta H_(vaporisation) of substance X (l) (molar mass : 30 g mol) is 300 J g at it\'s boling 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