Question

Use the Ɛ° from the standard reduction table to calculate ∆G° and Keq for each of the following reactions at 25°C (298K)

a) Pb⁺²(aq) + Mg(s)→Pb(s) + Mg⁺²(aq)

b) Br₂(l) + 2 Cl^-(aq)→Cl₂(g) + 2 Br^-(aq)

c) O₂(g)+2 H₂O(l) +2 Cu(s)→4 OH^- (aq) + 2 Cu⁺²

d) MnO₂ (s) + 4 H⁺(aq) +Cu(s)→Mn⁺²(aq) + 2 H₂O(l)+Cu⁺²(aq)

From standard reduction table:

Pb2+(aq) + 2e- → Pb(s) ε^ο(v) = -0.13
Mg2+(aq) + 2e- → Mg(s) ε^ο(v) = -2.37

Br2(l) + 2e- → 2Br-(aq) ε^ο(v) = +1.07
Cl2(g) + 2e- → 2Cl-(aq) ε^ο(v) = +1.36

O2(g) + 2H2O(l ) + 4e- → 4OH-(aq) ε^ο(v) = +0.40
Cu+2(aq) + 2e- → Cu(s) ε^ο(v) = +0.34

MnO2(s) + 4H+(aq) + 2e- → Mn+2(aq) + 2H2O(l) ε^ο(v) = +1.23
Cu+2(aq) + 2e- → Cu(s) ε^ο(v) = +0.34