To find the percentage yield you must take the actual yield and divide it by the theoretical yield and times it by 100. (Percent yield=Actual/Theoretical * 100) For this example the calculated (Theoretical value) was 4.8 tones and the tones produced (Actual value) was 3.2 tones. So 3.2/4.8 *100 = 66.6666666…. (Round how your teacher wants you too)
