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

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Question 7

When heated with a catalyst, potassium chlorate breaks down into potassium chloride and oxygen.

2KClO3→2KCl+3O22\text{KClO}_3 \rightarrow 2\text{KCl} + 3\text{O}_22KClO3​→2KCl+3O2​

A student heats a sample of potassium chlorate until no more gas is given off. She collects 1440 cm3 of oxygen, measured at room temperature and pressure.

  • Relative formula mass (MrM_rMr​) of potassium chlorate = 122.5
  • Volume of one mole of any gas at room temperature and pressure = 24 dm3

What mass of potassium chlorate did the student heat?

[1]
A

2.45 g2.45\ \text{g}2.45 g

B

4.90 g4.90\ \text{g}4.90 g

C

7.35 g7.35\ \text{g}7.35 g

D

11.0 g11.0\ \text{g}11.0 g

Markscheme

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

  1. GCSE
  2. /Chemistry
  3. /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.

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