Standard enthalpy of vapourisation \Delta _ { \mathrm { vap } } \mathrm {.. 5) For vaporization of water at 1 bar, \Delta H = 40.63 \mathrm {kJ} \ma.. Vapor Pressure 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 h vap Standard enthalpy of vapourisation \Delta _ { \mathrm { vap } } \mathrm {