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

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Question 7
H

Sodium hydrogencarbonate decomposes when it is heated.

2NaHCO3→Na2CO3+H2O+CO22\text{NaHCO}_3 \rightarrow \text{Na}_2\text{CO}_3 + \text{H}_2\text{O} + \text{CO}_22NaHCO3​→Na2​CO3​+H2​O+CO2​

A 4.20 g sample of sodium hydrogencarbonate was heated until there was no further change in mass. The relative formula mass of sodium hydrogencarbonate is 84. The volume of one mole of any gas at room temperature and pressure (rtp) is 24 dm3.

a.

Calculate the amount, in moles, of sodium hydrogencarbonate in the sample.

[1]
b.

Determine the volume, in cm3\text{cm}^3cm3, of carbon dioxide produced at rtp.

[3]
c.

Give one reason why the volume of carbon dioxide collected in this experiment could be 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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