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

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Question 3
H

A student has a sample of 5.6 g of iron and a sample of 4.4 g of carbon dioxide.

Relative atomic mass (ArA_rAr​): Fe=56\text{Fe} = 56Fe=56

Relative formula mass (MrM_rMr​): CO2=44\text{CO}_2 = 44CO2​=44

The Avogadro constant is 6.02 × 1023 per mole.

a.

Calculate the amount, in moles, of iron in the sample.

[2]
b.

Calculate the number of iron atoms in the sample.

Give your answer in standard form.

[2]
c.

The sample of carbon dioxide contains the same number of molecules as the number of iron atoms in the sample of iron.

Explain why.

[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

40 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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