The volume of an ideal gas in a container is 2.0 L. What will be the volume of the gas if the pressure on the container is doubled while the temperature is reduced from 400 K to 200 K?

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)