_____ law states that when chemical equations are combined algebraically, their enthalpies can be combined in exactly the same way.

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Hess's Law states that the total enthalpy change for a reaction is the same, no matter how many steps the reaction is carried out in. This means that if you can add up the steps of a reaction algebraically, you can also add up the enthalpy changes for those steps to find the total enthalpy change.

_____ Law States That When Chemical Equations Are Combined Algebraically