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

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Question 15

Potassium chlorate decomposes completely when heated.

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

A sample of potassium chlorate produced 900 cm3 of oxygen at room temperature and pressure.

The relative formula mass of potassium chlorate is 122.5.

The volume of one mole of any gas at room temperature and pressure is 24 dm3.

Calculate the mass of potassium chlorate that decomposed.

Give your answer to 3 significant figures.

[5]
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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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