Two ammonia reactor trials used the same starting mixture, temperature and pressure. The only difference was whether iron was present. The results are shown below.
| Trial | Iron present | Time to reach equilibrium (minutes) | Ammonia at equilibrium (%) |
|---|---|---|---|
| 1 | No | 40 | 18.0 |
| 2 | Yes | 12 | 18.0 |
Use the results to describe the effect of the iron on the reaction.
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.