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Discussion

Ammonia synthesis is exothermic and proceeds with a decrease in moles. Equilibrium is therefore favoured by

  • A.high temperature and high pressure
  • B.low temperature and low pressure
  • C.high temperature and low pressure
  • D.low temperature and high pressure

Answer: D

The exothermic reaction wants a low temperature and the reduction in moles wants a high pressure. In practice a compromise temperature is used because the rate at the thermodynamically ideal temperature is far too slow.

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