“The resultant heat change in a reaction is the same whether it takes place in one or several stages.” This statement is called

Lavoisier and Laplace law

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Hess's law

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Joule's law

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Le–chatelier's principle

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Solution

The correct option is B Hess's law
The total enthalpy change of the process is equal to the sum of the enthalpy changes of the individual phases.
This is called Hess's law.

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