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Determine the total number of electrons transferred in the following balanced reaction.

4 MnO4– (aq) + 12 H3O+ (aq) → 4 Mn2+ (aq) + 5 O2 (g) + 18 H2O (g)

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Mn in MnO4^- goes from +7 on the left to +2 on the right which is a change of 5 electrons. You have 4 moles so 4 x 5 20 electron change.

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