Question

Question #fee32

Answer 1

To calculate the percent yield, you divide the actual yield by the theoretical yield and multiply by 100.

EXAMPLE

What is the percent yield if 0.650 g of copper are formed when excess aluminum reacts with a 2.00 g of copper(II) chloride dihydrate according to the equation

3CuCl₂•2H₂O + 2Al → 3Cu + 2AlCl₃ + 2H₂O

Solution

First, calculate the theoretical yield of Cu.

2.00 g CuCl₂•2H₂O ×

`(1 mol CuCl₂•2H₂O)/(170.5 g CuCl₂•2H₂O) × (3 mol Cu)/(3 mol CuCl₂•2H₂O) × (63.55 g Cu)/(1 mol Cu)` =

0.745 g Cu

Now calculate the percent yield.

% yield = (actual yield)/(theoretical yield) × 100 % = `(0.650 g)/(0.745 g)` × 100 % = 87.2 %