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5.1 Monitoring chemical reactions

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Question 13

A solution contains 68.0 g/dm3\mathrm{g/dm^{3}}g/dm3 of hydrogen peroxide, H2O2\mathrm{H_{2}O_{2}}H2​O2​.

150 cm3\mathrm{cm^{3}}cm3 of the solution decomposes completely.

2H2O2(aq)→2H2O(l)+O2(g) \mathrm{2H_{2}O_{2}(aq) \rightarrow 2H_{2}O(l) + O_{2}(g)} 2H2​O2​(aq)→2H2​O(l)+O2​(g)

Mr M_r\,Mr​ of H2O2\mathrm{H_{2}O_{2}}H2​O2​ = 34.0

One mole of any gas occupies 24 000 cm3\mathrm{cm^{3}}cm3 at room temperature and pressure.

Calculate the volume of oxygen made at room temperature and pressure.

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5.1 Monitoring chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.1 Monitoring chemical reactions

152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.

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