Final answer:
The correct equilibrium constant expression for a hypothetical reaction in the provided format would be option b, which follows the principles of chemical equilibrium by placing the concentration of products in the numerator and reactants in the denominator.
Step-by-step explanation:
The equilibrium constant, often represented as Kc for reactions in solution or Kp for reactions involving gases, is a ratio of the concentrations or pressures of products to reactants, raised to the power of their coefficients from the balanced chemical equation. In the case of the provided reaction, none is specified. However, given the general format of equilibrium constant expressions, we can deduce the correct expression based on the general principles of chemical equilibrium.
For a hypothetical reaction like aA + bB → cC + dD, the equilibrium constant expression Kc would be given by:
[C]c[D]d / [A]a[B]b.
If we apply this information to the choices provided, option b appears to be the correct format as it places the square of the concentration of BrOCl in the numerator and the product of the concentrations of Br2 and OCl2 in the denominator. This follows the principle that the concentrations of products are in the numerator and the concentrations of reactants are in the denominator.