ALEKS Calculating Enthalpy of Vaporization from Vapor Pressure YouTube Standard enthalpy of vaporization (vapH) for water at 100C is 40.66 kJ.. What is `Delta U` when `2.0` mole of liquid water vaporises at `100^(@)C`? The heat of vaporisation `(Delta H_("vap".))` of water at `100^(@)C` is `40.66 KJmol^( 1)`. DeltaH` (vap) for water is `40.7 kJ mol^( 1)`. The entropy of vapourisation of water is
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