NCERT Class XI Chemistry Redox Reactions Solutions

Question : 25

Total: 30

In Ostwald’s process for the manufacture of nitric acid, the first step involves the oxidation of ammonia gas by oxygen gas to give nitric oxide gas and steam. What is the maximum weight of nitric oxide that can be obtained starting only with 10.00 g of ammonia and 20.00 g of oxygen?

Solution:

The reaction involved in the manufacturing process is :

4NH3(g)

4‌moles

5O2(g)

5‌moles

→

4NO(g)

4‌moles

+6H2O(g)
∴ 68 g of NH3 will react with 160 g of O2 to produce 120 g of NO(g) But oxygen which is actually available (20.0 g) is less than the amount which is required. Therefore, oxygen is the limiting reactant.
Now 160 g of O2 will form NO = 120 g
∴ 20 g of O2 will form NO =

(120)

(160)

×(20) = 15 g

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