Standard Enthalpy of Formation, \(\Delta H_{\rm f}^\circ \) phase changes.svg Standard enthalpy of vaporization (vapH) for water at 100C is 40.66 kJ.. 5.4: Vapor Pressure Chemistry LibreTexts DeltaH` (vap) for water is `40.7 kJ mol^( 1)`. The entropy of vapourisation of water is
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