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# Moles and Equilibrium

APCHEM-JLILND

Consider the reaction:

$$A(g) + B(s) ⇄ 2C(g) \quad \quad K = 4.0 × 10^{-7}$$

In an experiment, 0.50 mol of $A$ and $B$ is placed in a 5 L rigid, closed container and allowed to reach equilibrium.

Which of the following is the equilibrium concentration of $C$?

A

$4.0 × 10^{-5} \text{ M}$

B

$2.0 × 10^{-4} \text{ M}$

C

$1.0 × 10^{-4} \text{ M}$

D

$1.0 × 10^{-1} \text{ M}$