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3.1 Introducing chemical reactions

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Question 5

Sulfur dioxide reacts with oxygen to form sulfur trioxide.

2SO2+O2→2SO3 \mathrm{2SO_{2} + O_{2} \rightarrow 2SO_{3}} 2SO2​+O2​→2SO3​

A closed reaction vessel contains 14.4 g of sulfur dioxide and 6.40 g of oxygen. The reaction continues until one reactant is used up.

Relative atomic mass (ArA_rAr​): O = 16.0 S = 32.0

a.

Calculate the maximum mass of sulfur trioxide that can form. Show your working.

[4]
b.

Calculate the mass of reactant left in the vessel when the reaction stops.

[1]
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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