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

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Question 4
H

Figure shows three sealed containers, A, B and C. Each container holds a different gas.

Figure: Three sealed containers holding samples of helium, oxygen and carbon dioxide

image

Relative atomic masses (ArA_rAr​): He=4\text{He} = 4He=4, C=12\text{C} = 12C=12, O=16\text{O} = 16O=16

The Avogadro constant is 6.02 × 1023 per mole.

a.

Determine which container holds the greatest number of particles.

You must show your working.

[3]
b.

Calculate the number of oxygen atoms in container B.

Give your answer in standard form.

[2]
Markscheme

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

40 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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