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10.4 The Haber process and the use of NPK fertilisers

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Question 9

A manufacturer makes an NPK fertiliser by mixing the materials shown in the table.

MaterialFormulaMass in the fertiliser
Ammonium nitrateNH4NO3\text{NH}_4\text{NO}_3NH4​NO3​96.0 kg
Potassium chlorideKCl\text{KCl}KCl144.0 kg
Potassium dihydrogen phosphateKH2PO4\text{KH}_2\text{PO}_4KH2​PO4​60.0 kg

Relative atomic masses: H=1\text{H} = 1H=1, N=14\text{N} = 14N=14, O=16\text{O} = 16O=16.

Calculate the percentage by mass of nitrogen in the NPK fertiliser.

Give your answer to 3 significant figures.

[4]
Markscheme

10.4 The Haber process and the use of NPK fertilisers Questions

  1. GCSE
  2. /Chemistry
  3. /10.4 The Haber process and the use of NPK fertilisers

71 exam-style questions on AQA GCSE Chemistry 10.4 The Haber process and the use of NPK fertilisers, covering 10.4.1a The Haber process, 10.4.1b Equilibrium and rate in the Haber process, and 10.4.2 Production and uses of NPK fertilisers. Each one has a worked solution and a mark scheme showing where the marks go.

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