(a) Why is the heat of fusion (ΔHfus) of a substance smaller than its heat of vaporization (ΔHvap)?(b) Why is the heat of sublimation (ΔHsubl) of a substance greater than its ΔHvap?(c) At a given temperature and pressure, how does the magnitude of the heat of vaporization of a substance compare with that of its heat of condensation?

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