NCERT Class XI Chemistry Equilibrium Solutions

Question : 12

Total: 73

A mixture of 1.57 mol of N2, 1.92 mol of H2 and 8.13 mol of NH3 is introduced into a 20 L reaction vessel at 500 K. At this temperature, the equilibrium constant, Kc for the reaction N2(g)+3H2(g) ⇌ 2NH3(g) is 1.7 × 102. Is the reaction mixture at equilibrium? If not, what is the direction of the net reaction?

Solution:

The reaction is : N2(g)+3H2(g) ⇌ 2NH3(g)
Qc =

[NH3]2

[N2][H2]3

(

8.13

‌mol‌L−1)2

(

1.57

‌mol‌L−1)(

1.92

‌mol‌L−1)3

= 2.38 × 103
As Qc ≠ Kc, the reaction mixture is not in equilibrium.
As Qc > Kc, the net reaction will be in the backward direction.

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