Why is a temperature of about 450 °C used in the Haber process even though a lower temperature gives a higher equilibrium yield of ammonia?
Correct answer D. At lower temperatures the rate of reaction becomes too slow to be economical
Explanation
The forward reaction is exothermic, so low temperature favours ammonia, but the rate becomes far too slow. About 450 °C is a compromise giving acceptable yield at a useful rate.
Answer checked How we write and check questions
Discussion