A chemical reaction has a theoretical yield of 25 g, but only 20 g of product was obtained. What is the percentage yield of the reaction?
Correct answer: D. 80%
- A. 20%
- B. 25%
- C. 45%
- D. 80%
Explanation
Percentage yield is actual divided by theoretical multiplied by 100, so 20 over 25 multiplied by 100 gives 80 per cent. Dividing the other way round would give an impossible 125 per cent, which is the check worth making on every such answer. The missing 5 g is lost to transfer, side reactions or an incomplete reaction.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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About Theoretical and Percentage Yield
Theoretical yield is the maximum product predicted from a balanced equation and the amount of limiting reactant. Work includes identifying the limiting reagent, comparing theoretical and actual yield, and calculating percentage yield using stoichiometric mole relationships.
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