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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.
Change in enthalpy is sometimes equal to the heat energy that is absorbed or released by the system during a reaction. Enthalpy basically simplifies the calculations when the energy of the system is considered.he Heat energy associated with combustion is called enthalpy of combustion. The reaction is considered only in the presence of oxygen. When one mole of a substance burns completely in the presence of oxygen, then heat change is called enthalpy of combustion.