A fertiliser factory tests the Haber process at three temperatures. The table shows the equilibrium yield and the time taken for each batch to reach equilibrium.
| Temperature (°C) | Equilibrium yield (%) | Time to reach equilibrium (hours) |
|---|---|---|
| 350 | 52 | 8.0 |
| 450 | 38 | 2.0 |
| 550 | 22 | 0.8 |
The factory requires each batch to reach equilibrium within 3 hours and wants the highest possible equilibrium yield.
Which temperature should the factory use? Explain your answer.
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.