Chapter 22, Problem 22.7QAP

Calculate the theoretical potential of each of the following cells. Is the cell reaction spontaneous as written or spontaneous in the opposite direction?
(a) Pt|Cr³⁺(2.00 × 10^-4M),Cr²⁺(1.50 × 10-3 M)||Pb²⁺ (5.60 0215 × 10^-2M)|Pb
(b) Hg|Hg₂²⁺(2.00 × 10-2 M)||H⁺(1.50 × 10^-2 M),V³⁺ (2.00 × 10^-2M),VO²⁺(3.00 × 10-³M)|Pt
(e) Pt|Fe³⁺(3.00 × 10^-2 M), Fe²⁺ (4.00 × 10-⁵M)||Sn²⁺ (3.50 × 10^-2M), Sn⁴+ (5.50 × 10^-4 M)|Pt