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Four moles of PCl5 are heated in a close...

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 ?
(1) 0.50
(2) 1.00
(3) 1.15
(4) 0.05
(5) 0.25

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