Question detail
A reaction has a theoretical yield of 80 g but only produces 64 g of product. Calculate the percentage yield of the reaction.
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 80 g but only produces 64 g of product. Calculate the percentage yield of the reaction.
Answer
The answer is 80 %.
Explanation
This uses Percentage Yield because the objective is about (chemistry only) Define atom economy as a measure of the amount of starting materials that end up as useful 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 Percentage Yield
Students often confuse atom economy with percentage yield, thinking they are the same concept.
Remind students that atom economy measures 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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