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I think we will use Hess's Law solve for the total enthalpy of a reaction. It proves that enthalpy is a state function. (It can be added or subtracted easily because it is not dependent on the reaction's pathway.)
I'm in Lecture 4 and we just went through Hess's Law today during the 3pm lecture. Hess's Law states that enthalpy changes are additive (since enthalpy is a state function). Therefore, enthalpy at each step of a multi-step reaction can be added to give the total enthalpy change.
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