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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.
The enthalpy of formation (ÎHÂ°f) is defined as the heat change associated with the formation of one mole of a compound from its elements in their standard states. et cetera) should also be noted. For the formation reaction for MgO(s) written below (1).