Question detail
If a reaction has a theoretical yield of 120 g and the actual yield is 90 g, what is 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
If a reaction has a theoretical yield of 120 g and the actual yield is 90 g, what is the percentage yield?
Answer
The answer is 75 %.
Explanation
This uses Percentage Yield because the objective is about (chemistry only) Explain why yield may be reduced if reactants take part in unexpected reactions. The reasoning belongs to Percentage yield 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
Misunderstanding Unexpected Reactions
Students often think that unexpected reactions only reduce the yield of the desired product without considering that they can also produce unwanted by-products.
To fix this, students should remember that unexpected reactions can divert reactants away from forming the desired product, leading to both a lower yield of the desired product and the formation of by-products. Keep the correction anchored to Percentage yield; check formula, substitution, calculation, final answer, and unit where relevant.
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