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

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Question 5

A student compares two samples of molecular substances.

SubstanceMass of sample in g\text{g}gRelative formula mass (MrM_rMr​)
Sulfur hexafluoride14.6146
Propane8.844

The student says, “The sulfur hexafluoride sample must contain more molecules because it has a greater mass.”

The Avogadro constant is 6.02 × 1023 per mole.

Explain why the student's conclusion is incorrect.

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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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