Chapter 19, Problem 4KSP

When a current of 5.22 A is applied over 3.50 hours to a solution containing metal ions. 20.00 grams of metal are produced. Which of the following could be the metal ion in the solution?

$\begin{array}{l}\text{(a)}\\ {\text{Zn}}^{\text{2+}}\\ \text{(b)}\\ {\text{Au}}^{\text{3+}}\\ \text{(c)}\\ {\text{Ag}}^{\text{+}}\\ \text{(d)}\\ {\text{Ni}}^{\text{2+}}\\ \text{(e)}\\ {\text{Cu}}^{\text{2+}}\end{array}$