when do we use this two equation? is there a specific condition on when to use them ? : r ChemicalEngineering Calculation of Enthalpy of Vaporization at a Given Temperature 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 Delta Vap H Latent Heat of Vaporization Delta Hvap of Water calculated by corresponding states correlation in a one cell excel formula 24 19. (a) Use Trouton's rule, Delta Hvap^circ approx (88