Two pilot reactors contained the same amounts of purified nitrogen and hydrogen. The reactors were kept at the same temperature and pressure. Iron was added to Reactor 1 but not to Reactor 2.
| Reactor | Time taken to reach equilibrium in minutes | Percentage of ammonia at equilibrium |
|---|---|---|
| 1 | 20 | 28 |
| 2 | 60 | 28 |
A student concluded:
‘Adding iron increases the equilibrium yield of ammonia and makes the reaction faster.’
Evaluate the student’s conclusion. Use the results and your knowledge of catalysts.
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.