Question

state Hess's law pricipal

Answer 1

Hess's law states that the change of enthalpy in a chemical reaction (i.e. the heat of reaction at constant pressure) is independent of the pathway between the initial and final states. ...Hess's law allows the enthalpy change (ΔH) for a reaction to be calculated even when it cannot be measured directly.

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Answer 2

Hess law of constant heat summation states that regardless of the multiple stages or steps of a reaction the total enthalpy change for the reaction is the sum of all changes. This law is the manifestation that enthalpy is a state function.
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