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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 a given chemical reaction is constant, regardless of the reaction happening in one step or many steps. There is a second way to use Hess' Law and it is usually presented like this: Î´HÂ° rxn = Ï Î´HÂ° f (products) minus Ï Î´HÂ° f (reactants).