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

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Question 23

Copper reacts with oxygen to produce copper oxide.

2Cu+O2→2CuO2\text{Cu} + \text{O}_2 \rightarrow 2\text{CuO}2Cu+O2​→2CuO

A student heats 12.7 g of copper with 4.80 g of oxygen.

Relative atomic masses (ArA_rAr​): O=16\text{O} = 16O=16, Cu=63.5\text{Cu} = 63.5Cu=63.5

a.

Calculate the maximum mass of copper oxide that could be produced.

[5]
b.

Calculate the mass of oxygen remaining at the end of the reaction.

[2]
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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