Problem: A substance has a heat of vaporization of ΔHvap and heat of fusion of ΔHfus. Express the heat of sublimation in terms of ΔHvap and ΔHfus.

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ΔHfusion = heat associated with phase change from solid to liquid

ΔHvaporization = heat associated with phase change from liquid to gas

 ΔHsublimation = heat associated with phase change from solid to gas

Expressing the heat of sublimation in terms of ΔHvap and ΔHfus yields:

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A substance has a heat of vaporization of ΔHvap and heat of fusion of ΔHfus. Express the heat of sublimation in terms of ΔHvap and ΔHfus.