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5.1 Monitoring chemical reactions

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Question 10
F

Iron is extracted from iron oxide.

Fe2O3+3CO→2Fe+3CO2 \mathrm{Fe_{2}O_{3} + 3CO \rightarrow 2Fe + 3CO_{2}} Fe2​O3​+3CO→2Fe+3CO2​

A furnace uses 1.00 tonne of iron oxide and makes 0.560 tonnes of iron.

Relative atomic mass (ArA_rAr​): Fe = 55.8

Relative formula mass (MrM_rMr​): Fe2O3\mathrm{Fe_{2}O_{3}}Fe2​O3​ = 159.6

What is the percentage yield of iron?

[1]
A

56.0%

B

80.1%

C

125%

D

160%

Markscheme

5.1 Monitoring chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.1 Monitoring chemical reactions

57 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.

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