A reaction should give 90 g of product in theory, but 63 g is obtained. What is the percentage yield?
Answer and explanation
Correct answer: D. 70%
- Step 1: Percentage yield = actual yield / theoretical yield x 100.
- Step 2: 63 / 90 x 100 = 70%.
Answer
70%.
Why not the others: '142.86%' inverts the ratio of theoretical and actual yield; '0.7%' forgets to multiply by 100; '30%' gives the percentage lost, not the yield.
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