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) (HT only) Explain why a reaction pathway is chosen using data such as atom economy, yield, rate, equilibrium position and usefulness of by-products. 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
Confusing Atom Economy with Yield
Students often confuse atom economy with percentage yield, thinking they are the same concept.
To fix this, remember that atom economy measures the efficiency of a reaction in terms of how much of the starting materials become useful products, while percentage yield compares the actual product obtained to the theoretical maximum. Keep the correction anchored to Atom economy; check formula, substitution, calculation, final answer, and unit where relevant.
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