In the Haber process the purified gases are passed over an iron catalyst at about 450 ∘C450\ ^\circ\text{C}450 ∘C and about 200 atmospheres. The reaction is reversible.
Explain what is meant by a reversible reaction.
The forward reaction in the Haber process is exothermic. Give the energy change for the reverse reaction.
Give one reason why the nitrogen and hydrogen are purified before they enter the reactor.
In one hour a reactor produced 40 tonnes of ammonia. The maximum theoretical mass of ammonia was 160 tonnes.
Calculate the percentage yield of ammonia. Use the equation:
percentage yield = (mass of product actually made / maximum theoretical mass of product) × \times\,× 100
39 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.