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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.
We denote a standard enthalpy as, where the superscript Â° indicates standard-state conditions. The standard enthalpy of formation of a compound, , is the change in enthalpy for the reaction that forms 1 mol of the compound from its elements, with all substances in their standard states.