Question detail
In a reaction, the theoretical yield of a product is 80 g, but only 64 g is obtained. Calculate the percentage yield and express your answer to two significant figures.
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 theoretical yield of a product is 80 g, but only 64 g is obtained. Calculate the percentage yield and express your answer to two significant figures.
Answer
The answer is 80 %.
Explanation
This uses Percentage Yield because the objective is about (chemistry only) Use an appropriate number of significant figures in percentage-yield answers. (MS 2a). 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 significant figures to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3.
Common mistake
Significant Figures in Percentage Yield
Students often provide percentage yield answers with too many or too few significant figures, not aligning with the precision of the data used.
To fix this, students should determine the number of significant figures based on the least precise measurement used in their calculations and round their final answer accordingly.
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