The statement "The change of enthalpy of a chemical reaction is same whether the reaction takes place in one or several steps" is:

Le Chatelier's law

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van't Hoff's law

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first law of thermodynamics

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Hess's law.

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Solution

The correct option is A Hess's law.
Hess's law of constant heat summation states that, "The standard enthalpy of a reaction, which takes place in several steps, is the sum of the standard enthalpies of intermediate reactions into which the overall reactions may be divided at the same temperature".

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