# MnO_2(s) + 2H_2 O(I) +2e = Mn^2+ (aq) + 40H^- (aq) epsilon^o = 1.208 v 2HNO_3...

###### Question:

MnO_2(s) + 2H_2 O(I) +2e = Mn^2+ (aq) + 40H^- (aq) epsilon^o = 1.208 v 2HNO_3 (aq) + 2H^+ (aq) + 2e = N_2 O_4 (g) + 2H_2 O(I) epsilon^o = 0.96 v N_2 O_4(g) + 2H^+ (aq) + 2e = 2HNO_2 (aq) epsilon^o = 0.92 v Derive the reduction potential for reaction 3 above from two reduction potentials [2 above and 4 below], HNO_3 (aq) + 2H^+ (aq) + 2e = HNO_2 (aq) + H_2 O(l) epsilon^o = 0.94 v

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