The net enthalpy change in a chemical reaction is same, whether it is brought about in two or more different ways in one or several steps. It is known as:

(A) Henry’s Law
(B) Joule’s Principle
(C) Hess’s Law
(D) Law of Conservation of energy

Answer: (C) Hess’s Law
The net enthalpy change in a chemical reaction is same, whether it is brought about in two or more different ways in one or several steps. It is known as “Hess’s Law”.