Question detail

For Moles (HT only), which option best supports this Unit 4.3 objective: (HT only) Use the number of moles and relative formula mass to calculate the mass of a substance?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Use of amount of substance in relation to masses of pure substances

Question

A. 36 g
B. 18 g
C. 72 g
D. 12 g

Answer

The answer is 36 g.

Explanation

The correct option is 36 g. This uses Moles From Mass because the objective is about (HT only) Use the number of moles and relative formula mass to calculate the mass of a substance. The reasoning belongs to Moles (HT only) within Use of amount of substance in relation to masses of pure substances, 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 HT only to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3. The other options are weaker because they either use the wrong formula, the wrong unit, a vague relationship, or the wrong quantitative context.

Common mistake

Confusing Moles and Mass

Students often confuse the number of moles with the mass of a substance, leading to incorrect calculations.

Remember that to find mass, you need to multiply the number of moles by the relative formula mass. Use the formula: mass = moles × relative formula mass.

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For Moles (HT only), which ratio reasoning answer best supports this Unit 4.3 objective: (HT only) Use the number of moles and relative formula mass to calculate the mass of a substance?