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

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Question 3
H

Calcium carbonate decomposes when it is heated strongly.

CaCO3→CaO+CO2\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2CaCO3​→CaO+CO2​

A 12.5 g sample of calcium carbonate was heated until it had fully decomposed. The relative formula mass of calcium carbonate is 100. The volume of one mole of any gas at room temperature and pressure (rtp) is 24 dm3.

a.

Calculate the amount, in moles, of calcium carbonate in the sample.

[1]
b.

Determine the volume, in dm3\text{dm}^3dm3, of carbon dioxide produced at rtp.

Give your answer to 3 significant figures.

[3]
c.

The volume of carbon dioxide collected in the experiment was 2.70 dm3.

Suggest one reason why this volume is smaller than the volume calculated in part b.

[1]
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

40 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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