Empirical formula of Fe2+, Pb4+, F−, S2−

In this synthesis reaction what products will form

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)

Summarize possible ways in which phases of matter could combine to form a solution.