An engineer is choosing between two coolers for a pilot Haber process. The mixture entering the cooler contains ammonia, nitrogen and hydrogen.
The table shows the boiling points of the substances.
| Substance | Boiling point in °C |
|---|---|
| Ammonia | −33 |
| Nitrogen | −196 |
| Hydrogen | −253 |
| Cooler | Outlet temperature in °C |
|---|---|
| A | −40 |
| B | −20 |
Evaluate which cooler should be used to remove ammonia as a liquid while allowing both nitrogen and hydrogen to be recycled as gases.
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.