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3.1 Introducing chemical reactions

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Question 36

When aluminium powder is heated, it burns to give aluminium oxide. The balanced equation is shown.

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

How many moles of aluminium oxide form when 6 mol of aluminium react completely with excess oxygen?

[1]
A

4.5 mol

B

6 mol

C

2 mol

D

3 mol

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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