3.5 Use of amount of substance in relation to volumes of gases

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Question 9

A teacher makes oxygen for a class demonstration by heating potassium chlorate.

$2KClO3→2KCl+3O22\text{KClO}_3 \rightarrow 2\text{KCl} + 3\text{O}_2$

The relative formula mass ( $M_r$ ) of potassium chlorate is 122.5. At room temperature and pressure, one mole of any gas occupies 24 dm³.

The teacher needs 0.72 dm³ of oxygen, measured at room temperature and pressure.

Calculate the minimum mass of potassium chlorate the teacher must heat.

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Markscheme

3.5 Use of amount of substance in relation to volumes of gases Questions

GCSE
Chemistry
3.5 Use of amount of substance in relation to volumes of gases

100 exam-style questions on AQA GCSE Chemistry 3.5 Use of amount of substance in relation to volumes of gases, covering 3.5.1 Volumes of gases. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank·3.5 Use of amount of substance in relation to volumes of gases