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At $250^oC$, phosphorus pentachloride is dissociated:
$PCl_5(g)$ 
$PCl_3(g)$ $+$ $Cl_2(g)$
A $V$ liter container was filled initially with $n$ moles $PCl_5(g)$.
If $x$ moles $PCl_3(g)$ have been produced, there remain only .......(1) mole(s) $PCl_5(g)$.
Then the molarities are:
$[PCl_5)]$ = .......(2) $\frac{mol}{L}$
$[PCl_3)]$ = .......(3) $\frac{mol}{L}$
$[Cl_2)]$ = .......(4) $\frac{mol}{L}$
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