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Quantitative analysis

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Question 7

Iron can be extracted from iron(III) oxide by a highly exothermic reduction reaction with aluminium, known as the thermite reaction.

The balanced chemical equation for the reaction is:

Fe2O3+2Al→2Fe+Al2O3 \text{Fe}_2\text{O}_3 + 2\text{Al} \rightarrow 2\text{Fe} + \text{Al}_2\text{O}_3 Fe2​O3​+2Al→2Fe+Al2​O3​

Calculate the percentage atom economy for the production of iron in this reaction.

Relative atomic masses (ArA_rAr​): Al=27\text{Al} = 27Al=27 O=16\text{O} = 16O=16 Fe=56\text{Fe} = 56Fe=56

Relative formula masses (MrM_rMr​): Fe2O3=160\text{Fe}_2\text{O}_3 = 160Fe2​O3​=160 Al2O3=102\text{Al}_2\text{O}_3 = 102Al2​O3​=102

Give your answer to two significant figures.

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Quantitative analysis Questions

  1. GCSE
  2. /Chemistry
  3. /Quantitative analysis

Practise Edexcel GCSE Chemistry Quantitative analysis with exam-style questions for Foundation and Higher tier. 119 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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