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3.1 Introducing chemical reactions

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Question 28

A chemist heats 95.76 g of iron(III) oxide with 42.0 g of carbon monoxide.

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

The reaction continues until one reactant is used up.

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

a.

Calculate the maximum mass of iron that can be made. Identify the limiting reactant in your answer.

Show your working.

[5]
b.

Calculate the mass of the excess reactant left when 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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