posted by chem .
At a certain temperature, 2.00 moles of phosphorus(V) chloride, PCl5, was placed in a 1.0 L vessel and permitted to react as shown:
PCl5 (g) <-> PCl3 (g) + Cl2(g)
At equilibrium, the container held 0.40 PCl5. What is the numerical value of Kc for the system as written?