See photo please. I need help on balancing equations.

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)

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.

Is this correct if not can u correct me