Ammonia is produced by the Haber process. $\text{N}_2 + 3\text{H}_2 \rightleftharpoons 2\text{NH}_3$ What are the sources of the nitrogen and hydrogen used in the Haber process?
- Anitrogen: fertilisers; hydrogen: reacting methane with steam
- Bnitrogen: fertilisers; hydrogen: the air
- Cnitrogen: the air; hydrogen: reacting methane with steam
- Dnitrogen: the air; hydrogen: the air