Enthalpy of vaporization Wikipedia Calculate the vapor pressure of 3 pentanone (b.p. 102.0 C) vp vs temp.svg Describe (qualitatively) how standard enthalpy and entropy of vaporization of water will change with temperature. Homework.Study.com Delta Extrax Diamond Heights Disposable 3G D8 Gas 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