How much copper can you get with 13 g of zinc?

Let’s write the data on the condition of the problem:

Zn + CuCl2 = ZnCl2 + Cu;

We make calculations:
M (Zn) = 65.3 g / mol;

M (Cu) = 63.5 g / mol.

Determine the amount of the original substance:
Y (Zn) = m / M = 13 / 65.3 = 0.19 mol;

Y (Cu) = 0.19 mol so the amount of substances is 1 mol.

Find the mass of the metal:
m (Cu) = Y * M = 0.19 * 63.5 = 12.06 g

Answer: the mass of copper is 12.06 g