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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.
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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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