The Equilibrium Constant K_c for the Reaction Is 49 $\degree$

The equilibrium constant K_c for the reaction is 49 at 230 $\degree$ C. If 0.70 mol of PCl₃ is added to 0.70 mol of Cl₂ in a 1.00-L reaction vessel at 230 $\degree$ C, what is the concentration of PCl₃ when equilibrium has been established?

A) 0.049 M
B) 0.11 M
C) 0.30 M
D) 0.59 M
E) 0.83 M