Correct relationship between heat of fusion `(DeltaH_(fus))`, heat of vaporization `(DeltaH_("vap"))` and heat of sublimation `(DeltaH_("sub"))` is thermodynamics $\Delta \bar{h}_{vap}$ and $\Delta \bar{s}_{vap}$ from vapor pressure vs. temperature data Chemistry Stack Exchange Finding Delta H using ln P vs 1 T (Hvap Lab) Vapor Pressure Vapor Pressure For water vap H = 41 kJ mol^1 at 373 K and 1 bar pressure. Assuming that water vapour Sarthaks eConnect Largest Online Education Community