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3.1 Introducing chemical reactions

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Question 35

Aluminium powder reacts with oxygen in a sealed reaction vessel.

4Al+3O2→2Al2O3\mathrm{4Al + 3O_2 \rightarrow 2Al_2O_3}4Al+3O2​→2Al2​O3​

Before the reaction, the vessel contains 0.0400 mol of aluminium and 1.20 g of oxygen.

Relative atomic mass (ArA_rAr​): O = 16.0

Show, using a calculation, that oxygen is the excess reactant.

Calculate the mass of oxygen remaining when the reaction stops.

Mass of oxygen remaining = .................... g

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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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