Question detail
In a reaction, the theoretical yield of a product is 120 g, but only 90 g is obtained. Calculate the percentage yield.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Yield and atom economy of chemical reactions (chemistry only)
Question
In a reaction, the theoretical yield of a product is 120 g, but only 90 g is obtained. Calculate the percentage yield.
Answer
The answer is 75 %.
Explanation
This uses Percentage Yield because the objective is about (chemistry only) Explain why reactions with high atom economy can be economically important. The reasoning belongs to Atom economy within Yield and atom economy of chemical reactions (chemistry only), so it should not be confused with nearby quantitative ideas such as mass, moles, concentration, yield, atom economy, or gas volume unless those are named in the objective. Use the focus term chemistry only to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3.
Common mistake
Misunderstanding Economic Importance
Students often confuse the concept of atom economy with overall yield, thinking that a high yield alone indicates economic importance.
Emphasize that atom economy specifically measures how much of the starting materials are converted into useful products, which is crucial for sustainability and cost-effectiveness in industrial processes. Keep the correction anchored to Atom economy; check formula, substitution, calculation, final answer, and unit where relevant.
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