Essential Chemistry for IGCSE - The Chemical Industry (Section 1 - No. 4)
In the Haber process, what is the temperature commonly used, and why?
450°C, because it gives the highest yield of ammonia.
450°C, to achieve a balance between yield and reaction rate.
200°C, to minimize the energy input.
600°C, to maximize the reaction rate.
Explanation
450°C is a compromise. A lower temperature would give a higher yield (equilibrium position) but a slower rate. A higher temperature increases the rate, but reduces the yield.
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