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At $250^oC$, phosphorus pentachloride is dissociated:
$PCl_5(g)$ 
$PCl_3(g)+Cl_2(g)$
One mole of $PCl_5(g)$ was introduced in a container.
If only 0.75 mol de $PCl_5(g)$ remain when equilibrium is established, then there have been produced .......... mole(s) $PCl_3$ and .......... mole(s) $Cl_2$
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