Calculating Energy Change Phase Change Easy Peasy All in One High School Water Soluble Delta 8 750mg The Georgia Hemp Company Standard enthalpy of vaporisation`DeltaV_(vap).H^(Theta)` for water at `100^(@)C`is`40.66kJmol^( 1)`.Teh internal energy of Vaporization of water at` 100^(@)C("in kJ mol"^( 1))`is 3 Ways to Calculate Vapor Pressure wikiHow 5) For vaporization of water at 1 bar, \Delta H = 40.63 \mathrm {kJ} \ma.. Specific Heat Capacity of Water: Temperature Dependent Data and Calculator