State Hess's Law of Constant Heat Summation.
(N/A) Hess's Law of Constant Heat Summation states that the total enthalpy change for a chemical reaction is the same,whether the reaction occurs in one step or in several steps. Mathematically,the total enthalpy change is the algebraic sum of the enthalpy changes of the individual steps: $\Delta H_{total} = \sum \Delta H_{steps}$.
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