The difference between `Delta`H and `Delta`U at constant volume is equal to phase changes.svg 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 Internal energy and enthalpy Physical Chemistry I Class Fiveable
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delta vap h Use Hess's law to prove that Delta subH = Delta vapH + Delta fusH