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At equilibrium, the delta G of the reaction is 0. Think about G as the potential energy of a substance. When a reaction is at equilibrium, then the potential energy of the reactants and the potential energy of the products has to be equal, so there is no change in G. This is then useful for deriving the Van't Hoff equation, which we went into detail on how it was done in class. And the scenario the Van't Hoff equation is useful for is for when we know the delta H naught of a reaction and want to know the equilibrium constant at a different temperature.
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