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2.6 Calculations involving masses

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Question 18

A metal, M, forms a chloride with the formula MCl3\mathrm{MCl_3}MCl3​. The chloride contains 65.5% chlorine by mass.

The metal also forms an oxide with the formula M2O3\mathrm{M_2O_3}M2​O3​.

Relative atomic masses: Cl=35.5\mathrm{Cl} = 35.5Cl=35.5, O=16\mathrm{O} = 16O=16.

Calculate the percentage by mass of oxygen in M2O3\mathrm{M_2O_3}M2​O3​.

Give your answer to three significant figures.

[5]
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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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