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cathode → reduction → oxidation number decreases
anode → oxidation → oxidation number increases
For ions: charge of the ion = oxidation number
For neutral atoms/compound: oxidation number = 0
E°cell > 0 → spontaneous in the forward direction
E°cell < 0 → nonspontaneous in the forward direction
Calculate Eº cell for each of the following balanced redox reactions.
Determine whether the reaction is spontaneous as written.
a. 2Cu(s) +Mn2+(aq) → 2Cu+(aq) + Mn(s)
b. MnO2(s) + 4H+(aq) + Zn(s) → Mn2+(aq) + 2H2O(l) + Zn2+(aq)
c. Cl2(g) + 2F−(aq) → F2(g) + 2Cl−(aq)