Question

write short note on bond enthalpies​

Answer 1

The change in energy during a chemical reaction is the difference between how much energy it takes to break chemical bonds and how much energy is released when bonds form.

well....now simple question arise how to calculate it..

use this simple formula:-

(Amount of energy required to break the bonds of the reactant molecules - Amount of energy released when the bonds of the products form).

for better explaination just go through ur class 11 text book