At 207oC, Kp = 0.267 for the reaction
PCl5(g) ⇌ PCl3(g) + Cl2(g)
a. If 0.100 mole of PCl5(g) is placed in an otherwise empty 12.0-L vessel at 207oC, calculate the partial pressures of PCl5(g), PCl3(g), and Cl2(g) at equilibrium.
b. In another experiment the total pressure of an equilibrium mixture is 2.00 atm at 207oC. What mass of PCl5 was introduced into a 5.00- L vessel to reach this equilibrium position?