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Enthalpy of a reaction or energy change of a reaction D H, is the amount of energy or heat absorbed in a reaction. If the energy is required, D H is positive, and if energy is released, the D H, is negative.
State the second point in the Law of Additivity of Reaction Enthalpies. If a set of reactions occurs in different steps but the initial reactants and final products are the same, the overall enthalpy change is the same. State the third point in the Law of Additivity of Reaction Enthalpies. Define Hess's Law. The enthalpy change is independent of the pathway of the process and the number of intermediate steps in the process.