For the Equilibrium PCl₅(g) PCl₃(g)+ Cl₂(g),K_c = 2 $\times$ 10¹ at 240°C

For the equilibrium PCl₅(g) PCl₃(g) + Cl₂(g) ,K_c = 2.0 $\times$ 10¹ at 240°C.If pure PCl₅ is placed in a 1.00-L container and allowed to come to equilibrium,and the equilibrium concentration of PCl₃(g) is 0.23 M,what is the equilibrium concentration of PCl₅(g) ?

A) 0.46 M
B) 0.12 M
C) 0.012 M
D) 0.0026 M
E) 9.3 M