Question detail

In Gas volumes and amount of substance, which option best answers variant 3 of this quantitative chemistry 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. formula and unit: (chemistry only) (HT only) Calculate amount in moles from gas volume at room temperature and pressure
B. wrong formula: uses a different Unit 4.3 relationship from Gas volumes and amount of substance
C. wrong unit: gives a value without checking the required unit
D. wrong reasoning: confuses coefficients, subscripts, mass, moles, or concentration

Answer

The correct option is formula and unit: (chemistry only) (HT only) Calculate amount in moles from gas volume at room temperature and pressure.

Explanation

The correct option is formula and unit: (chemistry only) (HT only) Calculate amount in moles from gas volume at room temperature and pressure. It is correct because it directly supports the approved learning objective to (chemistry only) (HT only) Calculate amount in moles from gas volume at room temperature and pressure. This 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 the answer must use the named Unit 4.3 relationship and avoid mixing it with nearby ideas such as mass, moles, concentration, yield, atom economy, gas volume, coefficients, or subscripts.

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 option best supports this Unit 4.3 objective: (chemistry only) (HT only) Calculate amount in moles from gas volume at room temperature and pressure?