Problem: What is the balanced half‐reaction that occurs at the anode in the unbalanced overall cell reaction of a voltaic cell: 3 MnO4– + 5 Fe (s) → 3 Mn2+ + 5 Fe3+ a) MnO 4- (aq) + 8H (aq) + 5e - → Mn2+ (aq) + 4H 2 O(l)  b) 2MnO 4- (aq) +12H+ (aq) + 6e - → 2Mn2+ (aq) + 3H 2 O(l) c) Fe(s) → Fe3+ (aq) + 3e - d) Fe(s) → Fe2+ (aq) + 2e - e) Fe2+ (s) → Fe3+ (aq) + e -    

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What is the balanced half‐reaction that occurs at the anode in the unbalanced overall cell reaction of a voltaic cell:

3 MnO4+ 5 Fe (s) → 3 Mn2+ + 5 Fe3+

a) MnO 4- (aq) + 8H (aq) + 5e - → Mn2+ (aq) + 4H 2 O(l) 

b) 2MnO 4- (aq) +12H+ (aq) + 6e - → 2Mn2+ (aq) + 3H 2 O(l)

c) Fe(s) → Fe3+ (aq) + 3e -

d) Fe(s) → Fe2+ (aq) + 2e -

e) Fe2+ (s) → Fe3+ (aq) + e -

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Based on our data, we think this problem is relevant for Professor Christenson's class at Washington & Jefferson College.