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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.
By Anne Marie Helmenstine, Ph.D. Definition: The enthalpy of reaction (Î´H RXN) is the difference between the total enthalpy of the products of a reaction and the total enthalpy of the reactants. Related Articles.