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Essentially, when a liquid turns to gas, the bonds between atoms must be broken in order to become gas, which would presumably take a lot more heat than turning solids to liquid, which don't completely break the bonds but make them weaker.
Don't forget to add the enthalpy of any state changes when you are calculating the enthalpy for a reaction. This phase change from liquid to gas is crucial in determining how much energy will be left or used after the reaction.
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