Hess's 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, regardless of the number of steps the reaction is carried out in. Therefore, when chemical equations are combined, their enthalpies can also be combined algebraically to determine the overall enthalpy change.

Hess's Law States That When Chemical Equations Are Combined Algebraically