The following pictures represent the equilibrium state for four different reactions of the type A atoms are unshaded.X atoms are shaded.
-Which reaction has the largest equilibrium constant?

Question

The following pictures represent the equilibrium state for four different reactions of the type  A atoms are unshaded.X atoms are shaded. 
-Which reaction has the largest equilibrium constant?

Quizplus · Accepted Answer

The equilibrium constant (Kc) is given by the ratio of the concentrations of products to reactants, each raised to their stoichiometric coefficients. In reaction A, the only product is AB, which is formed from two A and two B atoms. Therefore, Kc will be higher when the concentrations of A and B atoms are high and the concentration of AB is low. From the given pictures, it is clear that the equilibrium state of reaction A has relatively more unshaded A and B atoms and less shaded AB molecules compared to the equilibria of reactions B, C, and D. Hence, reaction A has the largest equilibrium constant compared to the other reactions.

The Following Pictures Represent the Equilibrium State for Four Different