CHM1025 WS09 Q4

Using the following unbalanced equation,
a) calculate the maximum grams of copper you could produce when starting with 17.0 g of zinc and excess Cu2(SO4)3.
Zn(s) + Cu2(SO4)3(aq) → ZnSO4(aq) + Cu(s)
b) after completing the experiment, it was discovered that only 10.5 g of copper was made. What is the percent yield.