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3.3 Yield and atom economy of chemical reactions

3.3 Yield and atom economy of chemical reactions

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Question 7

Iron is extracted from iron(III) oxide in a blast furnace by reduction with carbon monoxide.

a.

Explain why carbon monoxide (or carbon) can be used to extract iron from iron(III) oxide.

[2]
b.

An equation for the reaction is:

Fe2O3+3CO→2Fe+3CO2 \text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2 Fe2​O3​+3CO→2Fe+3CO2​

Calculate the percentage atom economy for the reaction to produce iron.

Relative atomic masses (ArA_rAr​):

  • C=12\text{C} = 12C=12
  • O=16\text{O} = 16O=16
  • Fe=56\text{Fe} = 56Fe=56

Relative formula mass (MrM_rMr​):

  • Fe2O3=160\text{Fe}_2\text{O}_3 = 160Fe2​O3​=160

Give your answer to 3 significant figures.

[4]
Markscheme

3.3 Yield and atom economy of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.3 Yield and atom economy of chemical reactions

31 exam-style questions on AQA GCSE Chemistry 3.3 Yield and atom economy of chemical reactions, covering 3.3.1 Percentage yield and 3.3.2 Atom economy. Each one has a worked solution and a mark scheme showing where the marks go.

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