NCERT Class XI Chemistry Equilibrium Solutions

Question : 21

Total: 73

Equilibrium constant, Kc for the reaction
N2(g)+3H2(g) ⇌ 2NH3(g) at 500 K is 0.061.
At a particular time, the analysis shows that composition of the reaction mixture is 3.0 mol‌L–1‌N2, 2.0 mol‌L–1‌H2 and 0.5 mol‌L–1‌N‌H3. Is the reaction at equilibrium? If not in which direction does the reaction tend to proceed to reach equilibrium?

Solution:

Qc =

[NH3]2

[N2][H2]3

(0.5)2

(3.0)(2.0)3

= 0.0104
Given Kc = 0.061
As Qc ≠ Kc, reaction is not in equilibrium.
As Qc < Kc, reaction will proceed in the forward direction.

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