Question

The correct equation for $K_c$ for the following reaction is:
A(l) + B(g) ⇌ C(g)

• A. $K_c = \dfrac{[C]^2}{[A][B]}$
• B. $K_c = \dfrac{[B]}{[C]}$
• C. $K_c = \dfrac{[A][B]}{[C]}$
• D. $K_c = \dfrac{[C]}{[B]}$

Hint:

Pure solids and liquids are not included in the equilibrium expression for $K_c$.

Answer 1

The Correct Option is D

In equilibrium expressions, only gaseous and aqueous species are included.
Since A is a liquid, it is not included in the expression.
The balanced reaction is: A(l) + B(g) ⇌ C(g)
Hence, $K_c = \dfrac{[C]}{[B]}$