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

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Question 3

Potassium chlorate decomposes when heated.

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

720 cm3 of oxygen is produced 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.

What mass of potassium chlorate decomposed?

[1]
A

1.23 g1.23\ \text{g}1.23 g

B

3.68 g3.68\ \text{g}3.68 g

C

0.00245 g0.00245\ \text{g}0.00245 g

D

2.45 g2.45\ \text{g}2.45 g

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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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