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

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Question 6

A chemist compares four batches of pure substances.

Relative atomic masses (ArA_rAr​): H=1\text{H} = 1H=1, O=16\text{O} = 16O=16, S=32\text{S} = 32S=32, Cl=35.5\text{Cl} = 35.5Cl=35.5

BatchSubstanceMass
Ahydrogen, H2\text{H}_2H2​3.0 g
Bsulfur dioxide, SO2\text{SO}_2SO2​12.8 g
Cchlorine, Cl2\text{Cl}_2Cl2​21.3 g
Doxygen, O2\text{O}_2O2​24.0 g

Which of batches A–D has fewer molecules than all the others?

[1]
A

Batch D

B

Batch A

C

Batch B

D

Batch C

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

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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