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3.1 Introducing chemical reactions

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Question 15

In a furnace, iron(III) oxide reacts with carbon monoxide to form iron and carbon dioxide.

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

A sample of 15.96 g of iron(III) oxide reacts with 7.00 g of carbon monoxide.

Relative atomic mass (ArA_rAr​): C = 12.0 O = 16.0 Fe = 55.8

a.

Calculate the maximum mass of iron that can form.

[5]
b.

Calculate the mass of iron(III) oxide left after the reaction stops.

[2]
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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