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Because enthalpy is a state function, the enthalpy change of an overall reaction equals the sum for any algebraically equivalent sequence of reactions.
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Agreement of direct and staged thermochemical measurements supported the state-function relation now called Hess’s law.
The source theory, law, entity, prediction, or structural claim is directly tested, supported, constrained, or established by the target experiment or observation. Experimental support is not final logical proof; the edge detail states exactly what was measured.
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Hess cycles compute a reaction enthalpy by adding measured or tabulated state-function changes.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
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