Question detail
In a reaction, the desired product has a relative formula mass (Mr) of 100 g/mol, and the total relative formula mass of all products is 200 g/mol. Calculate the atom economy 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
In a reaction, the desired product has a relative formula mass (Mr) of 100 g/mol, and the total relative formula mass of all products is 200 g/mol. Calculate the atom economy of the reaction.
Answer
The answer is 50 %.
Explanation
This uses Atom Economy because the objective is about (chemistry only) Use ratios, fractions and percentages in atom-economy calculations. (MS 1c). 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 Ratios with Percentages
Students often confuse how to use ratios and percentages in atom-economy calculations, leading to incorrect answers.
To fix this, students should practice converting ratios to percentages by dividing the part by the whole and multiplying by 100, ensuring they understand the difference between the two concepts. Keep the correction anchored to Atom economy; check formula, substitution, calculation, final answer, and unit where relevant.
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