Question

Hess' law is related to

• A. Change in enthalpy during the reaction
• B. Rate of reaction
• C. Equilibrium constant
• D. Infulence of pressure on volume

Answer 1

The correct option is A Change in enthalpy during the reaction

According to Hess' law the total change in heat at constant pressure/enthalpy during the complete course of the reaction is same, does not matter whether change takes place in one step or in several steps.
Hence the heat of reaction at constant pressure is independent of the pathway between the initial and final states.