Heat of Vaporization from Vapor Pressure (Example) Calculated and Experimental Enthalpies vap H and vap H exp of Download Table 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 5 gram Delta 8 Disposable THC HHC Vape Pen with Preheat 4asvapes Vaping Products 3 Ways to Calculate Vapor Pressure wikiHow Calculate the vapor pressure of 3 pentanone (b.p. 102.0 C)