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What is the correct expression for calculating the enthalpy change of a reaction using Kirchhoff's equation?

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Q-00054834

∆H = ∆H(0) + ∫CpdT

∆H = ∆Hrxn + ∫CpdT

∆H = ∆Hf + ∫CpdT

∆H = ∆Hr - ∫CpdT

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