20. Giving that MnO4 - + 4H+ + 3e- → MnO2 + 2H2O ε° = 1.68V, and MnO2 + 4H+ + 2e- → Mn2+ + 2H2O ε° = 1.21V, what is the standard potential for MnO4 - + 8H+ + 5e- → Mn2+ + 4H2O?
(A) 2.89V
(B) 0.47V
(C) 2.62V
(D) 1.49V
(E) none of these

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