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?
- 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.
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