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

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Question 12

Silicon nitride is produced by reacting silicon with nitrogen.

3Si+2N2→Si3N43\text{Si} + 2\text{N}_2 \rightarrow \text{Si}_3\text{N}_43Si+2N2​→Si3​N4​

Relative atomic masses (ArA_rAr​): Si=28\text{Si} = 28Si=28, N=14\text{N} = 14N=14

a.

In one preparation, 21.0 g of silicon is used. Calculate the mass of nitrogen needed so that none of the silicon remains.

[3]
b.

Calculate the maximum mass of silicon nitride made in this preparation.

[2]
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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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