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Total equilibrium pressure necessary to ...

Total equilibrium pressure necessary to obtain 60% dissociation of `PCl_5` is P at 500 K. The relation between equilibrium constant `K_p` and P is

A

`K_p = frac{9}{16}P`

B

`K_p=frac{16}{9}P`

C

`K_p=frac{2}{5}P`

D

`K_p=frac{5}{2}P`

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