The difference between `Delta`H and `Delta`U at constant volume is equal to Delta Extrax HXY11 THC + D10 + THC H Live Resin 3ml Disposable Vape Pen Calm Leaf Solved Heat, q, is energy transferred between a system and Chegg.com Internal energy and enthalpy Physical Chemistry I Class Fiveable 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