The reaction A 2 + B 2 ⇌ 2AB has an equilibrium constant K c = 1.8.The following pictures represent reaction mixtures that contain A 2 molecules (shaded)and B 2 molecules (unshaded),and AB molecules.
-Which nonequilibrium mixture will react in the forward direction to reach equilibrium?

Question

The reaction A 2 + B 2 ⇌ 2AB has an equilibrium constant K c = 1.8.The following pictures represent reaction mixtures that contain A 2 molecules (shaded)and B 2 molecules (unshaded),and AB molecules. 
-Which nonequilibrium mixture will react in the forward direction to reach equilibrium?

Quizplus · Accepted Answer

Reaction mixture (3) has a higher concentration of A₂ and a lower concentration of AB compared to equilibrium. This means that there are more reactants than products, and the forward reaction (A₂ + B₂ ⇌ 2AB) needs to occur to reach equilibrium. The reaction quotient, Q, for mixture (3) can be calculated as follows: Q = [AB] / ([A₂] x [B₂]) Q = (2 / ([1/10] x [1/10])) Q = 200 Since Q is less than K_c, the forward reaction is favored and the system will move towards equilibrium by producing more AB molecules.

The Reaction A2 + B2 ⇌ 2AB Has an Equilibrium

The Reaction A₂ + B₂⇌ 2AB Has an Equilibrium