question_answer

Hess's law states "The enthalpy change accompanying a chemical change is independent of the route by which the chemical change occurs". Then, we can conclude that Hess's law is used for determination of

A) heat of reaction

B) heat of formation

C) heat of transition           

D) All of these

Correct Answer: D

Solution :

Heat of any types of reaction is calculated by using Hess law according to which heat change in any reaction is sum of heat change in various small steps.