Standard enthalpy of vaporisation \Delta _ { v a p } H ^ { \circ } for a .. Calculate the vapor pressure of 3 pentanone (b.p. 102.0 C) Hybrid Delta 8 Pen If \Delta {H}{vap }^{\circ} for {H}{2} {O} is 44 {kJ} {mol}^{ 1}, then amount of heat required to evaporate 9 {~g} of {H}_{2} {O} is :
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delta vap h Use Hess's law to prove that Delta subH = Delta vapH + Delta fusH