Hess's law

Thermodynamic law in chemistry

In physical chemistry and thermodynamics, Hess's law of constant heat summation, also known simply as Hess's law, is a scientific law named after Germain Hess, a Swiss-born Russian chemist and physician who published it in 1840. The law states that the total enthalpy change during the complete course of a chemical reaction is independent of the sequence of steps taken. Hess's law is now understood as an expression of the fact that the enthalpy of a chemical process is independent of the path taken from the initial to the final state (i.e.

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