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

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Question 20
H

Magnesium reacts with an excess of dilute hydrochloric acid.

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

240 cm3 of hydrogen is produced at room temperature and pressure. The relative atomic mass of magnesium is 24. The volume of one mole of any gas at room temperature and pressure is 24 dm3.

What mass of magnesium reacted?

[1]
A

0.010 g0.010\ \text{g}0.010 g

B

0.12 g0.12\ \text{g}0.12 g

C

0.24 g0.24\ \text{g}0.24 g

D

2.4 g2.4\ \text{g}2.4 g

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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