The heat of fusion (also called heat of melting), ∆Hfus, of ice is the enthalpy change for
H2O(s) → H2O(l); ∆Hfus
Similarly, the heat of vaporization, ∆Hvap, of liquid water is the enthalpy change for
H2O(l) → H2O(g); ∆Hvap
How is the heat of sublimation, ∆Hsub, the enthalpy change for the reaction
H2O(s) → H2O(g); ∆Hsub
related to ∆Hfus and ∆Hvap?