The Data Booklet should be used for this question. $560\,\text{kg}$ of nitrogen and $120\,\text{kg}$ of hydrogen are compressed, heated and then passed over an iron catalyst. Once the gas mixture has reached equilibrium, it contains $96\,\text{kg}$ of hydrogen. What mass of ammonia does it contain?
- A$24\,\text{kg}$
- B$68\,\text{kg}$
- C$136\,\text{kg}$
- D$680\,\text{kg}$