Single correct option
In the Haber process, N2 + 3H2 ⇌ 2NH3 (exothermic), the yield of ammonia at equilibrium is increased by
- A. Decreasing pressure and increasing temperature
- B. Increasing both pressure and temperature
- C. Increasing pressure and decreasing temperature
- D. Removing the catalyst
Show answer and solution
Answer: (C) Increasing pressure and decreasing temperature
By Le Chatelier's principle, high pressure favours the side with fewer gas moles (2 versus 4), and low temperature favours the exothermic forward reaction. A catalyst only speeds up reaching equilibrium. In industry a moderate temperature is used for a workable rate.
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