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3.2 Use of amount of substance in relation to masses of pure substances

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Question 46

A technician records the contents of two laboratory containers. A sealed container holds 66 g of propane, C3H8\text{C}_3\text{H}_8C3​H8​. A sample jar holds aluminium sulfide, Al2S3\text{Al}_2\text{S}_3Al2​S3​.

Relative atomic masses (ArA_rAr​): C=12\text{C}=12C=12, H=1\text{H}=1H=1, Al=27\text{Al}=27Al=27, S=32\text{S}=32S=32

a.

Calculate the amount of propane in the sealed container, in moles.

[2]
b.

Calculate the relative formula mass (MrM_rMr​) represented by Al2S3\text{Al}_2\text{S}_3Al2​S3​.

[1]
c.

For a preparation, the technician needs 0.24 mol of aluminium sulfide. Calculate the mass that should be removed from the jar.

[2]
Markscheme

3.2 Use of amount of substance in relation to masses of pure substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Use of amount of substance in relation to masses of pure substances

131 exam-style questions on AQA GCSE Chemistry 3.2 Use of amount of substance in relation to masses of pure substances, covering 3.2.1 Moles, 3.2.2 Amounts of substances in equations, 3.2.3 Using moles to balance equations, 3.2.4 Limiting reactants, 3.2.5a Concentration of solutions, and 3.2.5b Relating mass, volume and concentration. Each one has a worked solution and a mark scheme showing where the marks go.

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