The total change in bond energy for the reaction is determined from the difference between energy of bonds broken and bonds formed.
An exothermic reaction will have a negative total change in bond energy while an endothermic reaction will have a positive value.
Given the bond energies of chemical bonds between atoms, the total change can be calculated as follows:
The product will the total change in bond energy for the reaction.
A reaction will be exothermic if the total change in bond energy for the reaction is negative.
A reaction will be endothermic if total change in bond energy for the reaction.
Therefore, the total change in bond energy for the reaction is determined from the difference between energy of bonds broken and bonds formed.
An exothermic reaction will have a negative total change in bond energy while an endothermic reaction will have a positive value.
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