Final answer:
The equilibrium constant expression for the given reaction is K = [C]^c[D]^d / [A]^a[B]^b. For reactions involving gases and using partial pressures, the equilibrium constant expression is Kp = (PC)^c(PD)^d / (PA)^a(PB)^b.
Step-by-step explanation:
The equilibrium constant expression for the given reaction is
K = [C]c[D]d
____________
[A]a[B]b
Where [C], [D], [A], and [B] represent the concentrations of the respective species and c, d, a, and b represent their stoichiometric coefficients in the balanced equation.
For reactions involving gases and using partial pressures, the equilibrium constant expression is
Kp = (PC)c(PD)d
____________
(PA)a(PB)b
Where PC, PD, PA, and PB represent the partial pressures of the respective gases and c, d, a, and b represent their stoichiometric coefficients in the balanced equation.