When potassium permanganate (per-mang-uh-nate), KMnO4 (read: K M N O four), is added to oxalic acid, H2C2O4 (read: H two C two O four), in acidic aqueous solution, a redox reaction occurs. Given that the permanganate ion is reduced to manganese (II) ions, Mn^2+, and oxalic acid is oxidized to carbon dioxide, how many electrons are exchanged in the full balanced equation for this reaction?