Calculate the value of E° for each of the following reactions. Decide whether each is product-favored at equilibrium in the direction written. [Reaction (d) is carried out in basic solution.]

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(a) Br₂(e) + Mg(s) → Mg2+ (aq) + 2 Br (aq) (b) Zn²+ (aq) + Mg(s) → Zn(s) + Mg²+ (aq) (c) Sn²+ (aq) + 2 Ag+ (aq) → Sn¹+ (aq) + 2 Ag(s) (d) 2 Zn(s) + O₂(g) + 2 H₂O(l) + 4 OH-(aq) → 2 [Zn(OH)4]2 (aq)