Enthalpy being a state function leads to Hess's law. There are two logical conclusions that follow right away: if a chemical reaction is reversed, the sign on H(heat) is altered.
According to Hess's Law of Constant Heat Summation, or simply Hess's Law, no matter how many stages or steps there are in a reaction, the reaction's overall enthalpy change is equal to the sum of all changes.
Summary. We can better comprehend how a chemical system consumes energy during reactions by using bond enthalpy and enthalpy of reaction. The bond enthalpy measures both the strength of the bond and the amount of energy required to build or break it.
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