Solving Hess’ Law Problems

Hess’ Law states that the enthalpy change of a chemical reaction (physical process is also okay) is independent of the routes by which the reaction take place. But how does it work?

Combustion of methane. Combustion is well-known an example of exothermic reaction. It gives a negative enthalpy change.

Origin of Hess’ Law

Well, the law is an expression of the simple but important law of conservation of energy — stating that energy is conserved; energy can neither be created nor destroyed, but only transfer from…