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OpenStudy (anonymous):

According to the law of conservation of mass, the overall enthalpy change in a reaction is equal to the sum of the enthalpy changes of individual steps.

OpenStudy (frostbite):

That is correct, we also know that as Hess's law. However you are not limited to "real" reactions, hypothetical reactions are also allowed. If you got a specific question to the use of Hess's law please ask.

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