The enthalpy of reaction or ∆H reaction is the difference between the bond energy of the reactants and the bond energy of the products.
What is ∆H reaction?
The term ∆H reaction refers to the heat that is evolved or absorbed in a chemical reaction. It is also known as the enthalpy of reaction.
The question is incoherent but I will try to answer as much as possible. Using the values of bond energy, ∆H reaction = Bond energy of reactants - bond energy of products. This will give us the enthalpy of reaction.
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