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

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Question 19
H

A student added 0.048 g of magnesium ribbon to an excess of dilute hydrochloric acid and collected the hydrogen produced in a gas syringe.

Mg+2HCl→MgCl2+H2\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2Mg+2HCl→MgCl2​+H2​

The relative atomic mass of magnesium is 24. The volume of one mole of any gas at room temperature and pressure (rtp) is 24 dm3.

Figure: The apparatus used to collect and measure the volume of hydrogen produced

image

a.

Calculate the amount, in moles, of magnesium added.

[1]
b.

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

[3]
c.

The student found that the volume of hydrogen collected was less than the calculated volume.

Suggest one reason why.

[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

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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