Predict and calculate the effect of concentration changes on an equilibrium syst

Question

Predict and calculate the effect of concentration changes on an equilibrium system.

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Some PCl5 is allowed to dissociate into PCl3 and Cl2 at 523 K. At equilibrium, [PCl5] = 0.170 M, and [PCl3] = [Cl2] = 9.22×10-2 M. Additional PCl5 is added so that [PCl5]new = 0.268 M and the system is allowed to once again reach equilibrium.

(a) In which direction will the reaction proceed to reach equilibrium? _________ (to the right or to the left?)

(b) What are the new concentrations of reactants and products after the system reaches equilibrium?

Explanation / Answer

The reaction will go towards right side

Given K= 0.0501

PCl5. -----> PCl3 + Cl2

0.268-x. 0.0922.+x 0.0922+x

0.0501 = (0.0922.+x)*(0.0922.+x) /(0.268-x)

On solving,

X= 0.0211

PCl5 = 0.268-0.0211 =0.2469 M

PCl3 = 0.0922.+0.0211 = 0.1133 M

Cl2 = 0.0922.+0.0211 = 0.1133 M

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