JUPEBChemistryChemical Equilibrium

Write the expression for the equilibrium constant $K_c$ for the reaction 2SO$_2$(g) + O$_2$(g) ⇌ 2SO$_3$(g).

A$K_c = \dfrac{[\text{SO}_2]^2[\text{O}_2]}{[\text{SO}_3]^2}$
B$K_c = \dfrac{[\text{SO}_3]}{[\text{SO}_2][\text{O}_2]}$
C$K_c = \dfrac{[\text{SO}_3]^2}{[\text{SO}_2]^2[\text{O}_2]}$CORRECT
D$K_c = \dfrac{2[\text{SO}_3]}{2[\text{SO}_2][\text{O}_2]}$
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Toaster Teacher
Why the answer is C, and why the others tempt you.
$K_c$ is the product concentrations over reactant concentrations, each raised to the power of its stoichiometric coefficient. Coefficients become powers, not multipliers, and the products go in the numerator.
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