How Hess's law is used to calculate the change in enthalpy of a reaction?
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Hess's law derives directly from the law of conservation of energy, as well as its expression in the first law of thermodynamics. ... By Hess's law, the net change in enthalpy of the overall reaction is equal to the sum of the changes in enthalpy for each intermediate transformation: ΔH = ΔH1+ΔH2+ΔH3.
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