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8H + + MnO 4 → Mn 2+ + 4H 2 O. Add the number of electron lost and gained by each part such as. 2Cl → Cl 20 + 2e. 8H + + MnO 4 + 5e → Mn 2+ + 4H 2 O. To balance the number of electrons lost and gained in both parts, multiply both parts with .