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Hess' law is the fundamental basis behind all thermodynamic data and measurement. It emerges directly from the law of conservation of energy. The simplest statement of the law is: "The energy change between two different states is independent of the route taken between them". Syllabus referenceReactivity 1.2.2 - Hess’s law states that the enthalpy change for a reaction is independent of the pathway between the initial and final states.
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In Chapter 4.3