Question detail
A chemical reaction produces 50 g of product A from 200 g of reactants. The relative formula mass of product A is 100 g/mol. Calculate the atom economy for this 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 chemical reaction produces 50 g of product A from 200 g of reactants. The relative formula mass of product A is 100 g/mol. Calculate the atom economy for this reaction.
Answer
The answer is 25 %.
Explanation
This uses Atom Economy because the objective is about (chemistry only) Calculate atom economy for a reaction to form a desired product from a balanced equation. 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.
Remember that atom economy measures the efficiency of a reaction in terms of starting materials converted to 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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