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Four moles of PCl(5) are heated in a clo...

Four moles of `PCl_(5)` are heated in a closed 4 `dm^(3)` container to reach equilibrium at 400 K. At equilibrium 50% of `PCl_(5)` is dissociated. What is the value of `K_(c)` for the dissociation of `PCl_(5)` into `PCl_(3) "and" Cl_(2)` at 400 K ?

A

`0.50`

B

`1.00`

C

`1.15`

D

`0.25`

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