How does the law of conservation of energy relate to Hess' law?

According to Hess's law, a reaction's net energy change is unaffected by the path it takes; that is, its energy content remains constant. The reaction simply transforms from heat energy to chemical energy, or vice versa.

Because energy cannot be created or destroyed—it can only be changed from one form to another—the law of conservation of energy implies that net energy content is constant.

The law of conservation of energy states that energy cannot be created or destroyed in an isolated system; it can only change forms. Hess's law is a principle in chemistry that states that the total enthalpy change for a chemical reaction is the same, regardless of the number of steps or the pathway taken to reach the final products. The relationship between the two lies in the fact that both laws emphasize the conservation of energy. In chemical reactions, energy is conserved according to the law of conservation of energy, and Hess's law allows us to calculate the total energy change for a reaction by considering the energies of individual steps or pathways.