Chemistry · Grades 9–12
Percentage yield
Compare actual pure product with the theoretical maximum in the same units. Yield and purity are different quantities.
Rule and assumptions
Compare actual pure product with the theoretical maximum in the same units. Yield and purity are different quantities.
yield % = actual/theoretical × 100
Worked examples
The theoretical dry pure product mass is 121 g; the actual dry pure product mass is 27 g. Find percentage yield. Round to 3 decimal places if needed. Answer in %.
yield % = actual/theoretical × 100 27/121 × 100 = 22.314
22.314 %
The theoretical dry pure product mass is 26 g; the actual dry pure product mass is 21 g. Find percentage yield. Round to 3 decimal places if needed. Answer in %.
yield % = actual/theoretical × 100 21/26 × 100 = 80.769
80.769 %
Try two questions
The theoretical dry pure product mass is 99 g; the actual dry pure product mass is 62 g. Find percentage yield. Round to 3 decimal places if needed. Answer in %.
The theoretical dry pure product mass is 165 g; the actual dry pure product mass is 140 g. Find percentage yield. Round to 3 decimal places if needed. Answer in %.
Answers and reasoning
Answers and marking notes
- 62.626 %
yield % = actual/theoretical × 100 62/99 × 100 = 62.626
- 84.848 %
yield % = actual/theoretical × 100 140/165 × 100 = 84.848
Further reading and review references
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Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.