The meaning of HESS'S LAW is a statement in chemistry: the heat change in a chemical reaction is the same regardless of the number of stages in which the reaction is effected.
Let's take a few moments to review what we've learned about Hess's Law, including it's formula. Hess's law states that it doesn't matter what path we take from reactants to products, the enthalpy change will always be the same. Enthalpy is the amount of energy in a compound. So...
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Because Hess's law holds true, it's possible to break a chemical reaction into multiple steps and use the standard enthalpies of formation to find the overall energy of a chemical reaction. Standard enthalpy tables are compiled from empirical data, usually acquired usingcalorimetry. Using these ta...