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5.1 Monitoring chemical reactions

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Question 7
F

Iron is extracted in a blast furnace. Carbon dioxide is a waste product.

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

Relative atomic mass (ArA_rAr​): Fe = 55.8

Relative formula mass (MrM_rMr​): CO2\mathrm{CO_{2}}CO2​ = 44.0

Use the equation: atom economy = mass of desired product in the equationtotal mass of all products in the equation×100\displaystyle \frac{\text{mass of desired product in the equation}}{\text{total mass of all products in the equation}}\times100total mass of all products in the equationmass of desired product in the equation​×100

What is the atom economy for making iron?

[1]
A

45.8%

B

54.2%

C

55.9%

D

84.5%

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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