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10.4 The Haber process and the use of NPK fertilisers

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Question 13

A plant tests the Haber process at two temperatures. The pressure is 200 atmospheres in both tests. The percentage yield is measured at equilibrium.

Temperature (°C)Ammonia yield (%)Relative rate of reaction
400321.0
450181.6

Use the results to explain why the plant operates at 450 °C rather than 400 °C.

[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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