Question detail
A reaction has a theoretical yield of 120 g and produces 90 g of product. 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
A reaction has a theoretical yield of 120 g and produces 90 g of product. Calculate the percentage yield.
Answer
75 %
Explanation
This answer is correct because it directly supports the approved learning objective: (chemistry only) Explain why reactions with high atom economy are important for sustainable development. It stays inside Atom economy, uses chemistry only as the revision focus, and gives the Chemistry reasoning needed for an exam-style response.
Common mistake
Misunderstanding Atom Economy
Students often confuse atom economy with percentage yield, thinking they measure the same thing.
Remind students that atom economy focuses on the efficiency of starting materials turning into useful products, while percentage yield measures the actual product obtained compared 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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