A chemical plant tests three pressures for making ammonia in the Haber process. The other Haber-process conditions are kept the same.
| Pressure / atmospheres | Ammonia yield per pass / % | Relative reaction rate | Equipment cost index |
|---|---|---|---|
| 100 | 14 | 0.8 | 2 |
| 200 | 18 | 1.0 | 3 |
| 400 | 20 | 1.2 | 8 |
Which pressure should the plant 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.