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Mention the conditions required to maximise the yield of ammonia. |
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Answer» Solution :Ammonia is PREPARED by the Haber.s process. Optimum conditions for the MANUFACTURE of ammonia are as under: `N_2(g) + 3H_2(g) overset({:( 700 K "," 200 xx 10^5 PA),("Iron oxide " + K_2O + Al_2O_3 "(catalyst)"),("Mo-( promoter)"):})(iff) 2NH_3 (g) , Delta_f H^(@) = -92.4 kJ " mol"^(-1)` In accordance with Le Chatelier.s principle, to maximise the yield, a high pressure of `200 xx 10^(5)` Pa is used. To increase the rate of the reaction, a temperature of around 700 K is used and iron oxide mixed with some `K_2O and Al_2O_3` is used as a catalyst. Sometimes, Mo is also used as a promoter to increase the efficiency of the Fe catalyst. |
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