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In the Haber process for the industrial manufacturing of ammonia involving the reaction, N2 (g) + 3H2 (g) 2NH3 (g) at 200 atm pressure in the presence of a catalyst, a temperature of about 500ºC is used. This is considered as optimum temperature for the process because

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In order to yield the maximum yield of ammonia, the temperature is lowered though 500oC is not a low temperature. This temperature (500oC) is a compromise temperature to produce reasonably a high proportion of ammonia in the equilibrium mixture in a very short time.

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