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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.
Heat of Reaction. The change in enthalpy for a reaction is known as the heat of reaction and has symbol Î´H. Î´H is negative for all exothermic reactions and positive for all endothermic reactions. The states (gas, liquid, solid) of all products and reactants must be stated in any reaction involving enthalpy.