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If you're trying to incorporate a phase change into your calculation, you must take into which phase change it is. The increase in enthalpy needed to melt ice, is different from the increase in enthalpy needed to boil water. Once you know what kind of phase change you're dealing with, include it in the enthalpy differences of , for example, calculating bond enthalpies.
When calculating total enthalpy you have to account for whether or not the substance is its standard phase. For example if its a gas in its standard state and is currently a liquid, you would have to add the enthalpy of its vaporization to total enthalpy.
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