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Calculate the standard free energy change(AG) of the MnO₂/MnO4 and Cu/Cu²+ voltaic cell given the following.

MnO4 (aq) + 4 H*(aq) + 3 e -> MnO₂(s) + 2 H₂O(l) .034

Cu²+ (aq) + 2 e → Cu(s) 1.68

F = 96485 C/mol e