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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.
Using bond enthalpies... Bond enthalpies can be used to calculate an overall enthalpy change, D H, for a chemical reaction. It is an over-simplification, but bonds are broken in the reactants and new bonds are formed in the products.ond making is an exothermic process. But, if a particular bond in a molecule is broken and then reformed the same amount of energy must be involved, because the First Law of Thermodynamics (also known as the 'law of conservation of energy') must apply.