If the Kc expression includes only products, what does that imply?

When the equilibrium constant expression (Kc) includes only the products of a reaction, it implies that the products are favored at equilibrium. This occurs because the expression for Kc is formulated based on the concentrations of products raised to the power of their coefficients divided by the concentrations of reactants raised to the power of their coefficients. If the Kc expression includes only the products, it indicates that the concentration of products at equilibrium is significantly greater than that of the reactants, signifying that the reaction has proceeded in favor of product formation.

In cases where only products are noted in Kc, it can suggest that the reaction is strongly product-driven, aligning with a situation where the forward reaction is predominant and the reverse reaction does not contribute significantly to the composition of the system at equilibrium. This does not inherently mean that the reaction is irreversible; rather, it reflects the position of equilibrium towards the products. Therefore, the interpretation that the products are favored is accurate and central to the understanding of the equilibrium dynamics represented by the Kc expression.