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At $250^oC$, phosphorus pentachloride is dissociated:
$PCl_5(g)$ 
$PCl_3(g)$ $+$ $Cl_2(g)$
$PCl_5(g)$ was introduced in a 6 L container and now there remains only 0.6 mol, whereas there are also 0.3 moles $PCl_3(g)$ produced by the reaction.
Then the molarities are:
$[PCl_5)]$ = .......(1) $\frac{mol}{L}$
$[PCl_3)]$ = .......(2) $\frac{mol}{L}$
$[Cl_2)]$ = .......(3) $\frac{mol}{L}$
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