Question detail

For Gas volumes and amount of substance, which option best supports this Unit 4.3 objective: (chemistry only) (HT only) Calculate amount in moles from gas volume at room temperature and pressure?

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 volumes of gases (chemistry only) (HT only)

Question

A. 2 mol
B. 1 mol
C. 3 mol
D. 4 mol

Answer

The answer is 2 mol.

Explanation

The correct option is 2 mol. This uses Gas Volume at Room Temperature and Pressure because the objective is about (chemistry only) (HT only) Calculate amount in moles from gas volume at room temperature and pressure. The reasoning belongs to Gas volumes and amount of substance within Use of amount of substance in relation to volumes of gases (chemistry only) (HT 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. 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 Volume and Moles

Students often confuse the volume of a gas with the amount in moles, forgetting that they need to use the relationship that 1 mole of gas occupies 24 dm3 at room temperature and pressure.

To fix this, remember to use the formula: moles = volume / 24 dm3 when calculating the amount in moles from gas volume.

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For Gas volumes and amount of substance, which ratio reasoning answer best supports this Unit 4.3 objective: (chemistry only) (HT only) Calculate amount in moles from gas volume at room temperature and pressure?