Final answer:
The percent yield can be calculated by dividing the actual yield of the product by the theoretical yield, and multiplying by 100.
Step-by-step explanation:
To calculate the percent yield, you need to compare the actual yield to the theoretical yield. The actual yield is the amount of product obtained in the lab, which is 14.5 g of O2 in this case. The theoretical yield is the maximum amount of product that could be formed, which is calculated to be 22.0 g of O2.
To calculate the percent yield, divide the actual yield by the theoretical yield and multiply by 100. So, the percent yield can be calculated as (14.5 g / 22.0 g) x 100 = 65.9%.