Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12

# Mention the Conditions Required to Maximise the Yield of Ammonia. - Chemistry

Mention the conditions required to maximise the yield of ammonia.

#### Solution 1

Ammonia is prepared using the Haber’s process. The yield of ammonia can be maximized under the following conditions:

(i) High pressure (∼ 200 atm)

(ii) A temperature of ∼700 K

(iii) Use of a catalyst such as iron oxide mixed with small amounts of K2O and Al2O3

#### Solution 2

Ammonia is prepared by Haber’s process as given below:

triangle_rH^@ = -92.4 kJ mol^(-1)

According to Le Chatelier's principle to maximise the yield of ammonia high P and T=~700 K should be used. The catalyst increases the rate of reaction and Mo promoter increase the efficiency of Fe catalyst.

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#### APPEARS IN

NCERT Class 12 Chemistry Textbook
Chapter 7 The p-block Elements
Q 4 | Page 172