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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.
Therefore, the energy of solution formation, the enthalpy of solution, equals the sum of the three steps: DHsoln = DH1 + DH2 + DH3. 1  The breaking of bonds requires or absorbs energy. This process is endothermic. 2  The formation of bonds releases energy. This process is exothermic.