Answer:
[tex]K_{c} = [\text{C}]^{2}[\text{[D]}[/tex]
Explanation:
[tex]\rm A(s)+3B(l) \, \rightleftharpoons \, 2C(aq)+D(aq)[/tex]
The general formula for an equilibrium constant expression is
[tex]K_{c} = \dfrac{[\text{Products}]}{[\text{Reactants}]}[/tex]
Solids and liquids are not included in the equilibrium constant expression.
Thus, for this reaction,
[tex]K_{c} = [\textbf{C}]^{\mathbf{2}}\textbf{[D]}[/tex]