Discussion
Consider the following statements about ammonia synthesis conditions.
1. High pressure favours the equilibrium because moles decrease.
2. Low temperature favours the equilibrium because the reaction is exothermic.
3. The process is run at low temperature to maximise the yield.
Answer: A
The first two are correct but the third does not follow, because at low temperature the rate is impractically slow and a compromise temperature around four hundred and fifty degrees is used instead. Recycle makes up for the modest single pass conversion.
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