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 takes place in one step or in several steps. It is the algebraic sum of the enthalpy changes of the individual steps of the reaction.
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Which of the following equations corresponds to the definition of enthalpy of formation at $298 \ K$?
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