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3.2 Use of amount of substance in relation to masses of pure substances

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Question 51

Hydrogen reacts with oxygen to form water.

2H2+O2→2H2O2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}2H2​+O2​→2H2​O

Relative formula masses (MrM_rMr​): H2=2\text{H}_2 = 2H2​=2, O2=32\text{O}_2 = 32O2​=32, H2O=18\text{H}_2\text{O} = 18H2​O=18

A sample of hydrogen has a mass of 2.0 g.

a.

Calculate the amount of hydrogen in the sample, in moles.

[1]
b.

Calculate the mass of oxygen needed to react with all of the hydrogen in the sample.

[2]
c.

Calculate the mass of water formed when all the hydrogen reacts.

[2]
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3.2 Use of amount of substance in relation to masses of pure substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Use of amount of substance in relation to masses of pure substances

131 exam-style questions on AQA GCSE Chemistry 3.2 Use of amount of substance in relation to masses of pure substances, covering 3.2.1 Moles, 3.2.2 Amounts of substances in equations, 3.2.3 Using moles to balance equations, 3.2.4 Limiting reactants, 3.2.5a Concentration of solutions, and 3.2.5b Relating mass, volume and concentration. Each one has a worked solution and a mark scheme showing where the marks go.

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