Question

why might the sum of the 2 reactions yield a vslue cloder to the theoretical value for the enthalpy of the reaction than the reaction completed in a single step

Answer 1

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.

What does Hess's law say about the reaction's overall enthalpy change?

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.

What can we infer about a reaction from its enthalpy?

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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