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2.6 Calculations involving masses

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Question 29

An unlabelled bottle contains one pure copper compound. Analysis shows that copper accounts for 66.7% of the compound's mass. Relative atomic masses: O=16\mathrm{O} = 16O=16, S=32\mathrm{S} = 32S=32, Cl=35.5\mathrm{Cl} = 35.5Cl=35.5, Cu=64\mathrm{Cu} = 64Cu=64.

Which formula should be written on the bottle?

[1]
A

CuCl2\mathrm{CuCl_{2}}CuCl2​

B

Cu2O\mathrm{Cu_{2}O}Cu2​O

C

CuS\mathrm{CuS}CuS

D

CuO\mathrm{CuO}CuO

Markscheme

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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