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Chemical Equilibrium : Solution set

For the following reaction at 600. K, the equilibrium constant, Kp, is 11.5

PCl5(g)<---> PCl3(g) + Cl2(g)

Suppose that 3.010 g of PCl5 is placed in an evacuated 580. mL bulb, which is then heated to 600. K.
a)What would be the pressure of PCl5 if it did not dissociate?
b)What is the partial pressure of PCl5 at equilibrium?
c)What is the total pressure in the bulb at equilibrium?
d)What is the degree of dissociation of PCl5 at equilibrium?