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5.1 Monitoring chemical reactions

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Question 45

Hydrogen reacts completely with excess oxygen.

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

The volume of hydrogen is measured at room temperature and pressure.

Relative atomic mass (ArA_rAr​): H = 1.0, O = 16.0

Calculate the mass of water formed from 7.2 dm37.2\,\mathrm{dm^{3}}7.2dm3 of hydrogen.

Mass = ...... g

[3]
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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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