For the Equilibrium PCl₅(g) PCl₃(g)+ Cl₂(g),K_c = 2

For the equilibrium PCl₅(g) PCl₃(g) + Cl₂(g) ,K_c = 2.0 × 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 0.27 M,what is the equilibrium concentration of PCl₅(g) ?

A) 0.54 M
B) 0.13 M
C) 0.013 M
D) 0.0036 M
E) 8.6 M