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At $250^oC$, phosphorus pentachloride is dissociated :
$PCl_5(g)$ 
$PCl_3(g)$ $+$ $Cl_2(g)$
One mole of $PCl_5(g)$ is introduced in a 10 L container. At the time when only 0.3 mol de $PCl_5(g)$ remain, the number of moles of $PCl_3$ will be .......... mole(s) and its molarity .......... $\frac{mol}{L}$
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