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3.1 Introducing chemical reactions

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Question 29

Iron(III) oxide and carbon monoxide are allowed to react. A mixture containing 79.8 g of iron(III) oxide and 42.0 g of carbon monoxide has neither reactant left when the reaction is complete.

Fe2O3+3CO→2Fe+3CO2 \mathrm{Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2} Fe2​O3​+3CO→2Fe+3CO2​

What mass of iron(III) oxide is needed if 63.0 g of carbon monoxide is to be used up completely?

[1]
A

100.8 g

B

79.8 g

C

63.0 g

D

119.7 g

Markscheme

3.1 Introducing chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.1 Introducing chemical reactions

134 exam-style questions on OCR GCSE Chemistry 3.1 Introducing chemical reactions, covering 3.1.1 Writing formulae and balanced chemical equations, 3.1.2 Formulae of compounds from ions, and state symbols, 3.1.3 Conservation of mass and observed changes in mass, 3.1.4 Half equations and balanced ionic equations, 3.1.5 The mole and the Avogadro constant, and 3.1.6 Stoichiometry, limiting reactants and reacting masses. Each one has a worked solution and a mark scheme showing where the marks go.

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