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2.6 Calculations involving masses

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Question 40

A sample of aluminium has a mass of 13.5 g. Use Ar(Al)=27A_r(\mathrm{Al}) = 27Ar​(Al)=27 and the Avogadro constant 6.02×1023 mol−16.02 \times 10^{23}\,\mathrm{mol^{-1}}6.02×1023mol−1.

Calculate the number of aluminium atoms in the sample.

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2.6 Calculations involving masses Questions

  1. GCSE
  2. /Chemistry
  3. /2.6 Calculations involving masses

142 exam-style questions on Edexcel GCSE Chemistry 2.6 Calculations involving masses, covering 2.6.1 Relative formula mass and percentage composition, 2.6.2 Empirical and molecular formulae, 2.6.3 Conservation of mass, 2.6.4 Reacting masses and concentration in g dm⁻³, 2.6.5 The mole and the Avogadro constant, and 2.6.6 Limiting reactants and stoichiometry. Each one has a worked solution and a mark scheme showing where the marks go.

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