Question

PCl5 decomposes to PCl3 and Cl2. If the initial concentration of PCl5 is 0. 200 m and the final concentration is 0. 120 m. What is the equilibrium constant for the reaction?

Answer 1

PCl5 decomposes to PCl3 and Cl2.At an equilibrium constant is 0.0533.

The equilibrium constant, ok, expresses the connection among merchandise and reactants of a reaction at equilibrium with admire to a selected unit. The quantity values for are taken from experiments measuring equilibrium concentrations. The value of k shows the equilibrium ratio of merchandise to reactants. In an equilibrium mixture each reactants and products co-exist. big k > 1 products are desired k = 1 neither reactants nor merchandise are preferred.

The equilibrium will shift within the reverse path so that the effect of increased strain is nullified. for this reason, with growth in stress, the dissociation of PCl5 is suppressed and the degree of dissociation of PCl5 decreases.

PCl5  ===========> PCl3 +  CL2

0.200                                   0             0    (initial)

0.200-x                                x             x   (at equilibrium)

at equilibrium [PCL5] = 0.120

SO,

0.200 - x = 0.120

x = 0.080 M

Kc = [PCl3] [Cl2] / [PCl5]

    = x*x / (0.200 -x)

     = 0.080 * 0.080 / (0.120)

      = 0.0533

Hence equilibrium constant is  = 0.0533.

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