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

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Question 11

Calcium reacts with nitrogen to form calcium nitride.

3Ca+N2→Ca3N23\text{Ca} + \text{N}_2 \rightarrow \text{Ca}_3\text{N}_23Ca+N2​→Ca3​N2​

Relative atomic masses (ArA_rAr​): Ca=40\text{Ca} = 40Ca=40, N=14\text{N} = 14N=14

A mixture of 12.0 g of calcium and 5.6 g of nitrogen is heated until no further reaction occurs.

a.

Calculate the relative formula mass (MrM_rMr​) of calcium nitride, Ca3N2\text{Ca}_3\text{N}_2Ca3​N2​.

[1]
b.

Calculate the maximum mass of calcium nitride that can be produced.

[5]
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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