Chemical equilibrium

Tutorial 3

    

At $250^oC$, phosphorus pentachloride is dissociated according to: $PCl_5(g)$ $PCl_3(g)$ $+$ $Cl_2(g)$ If one mole of $PCl_5(g)$ is introduced in a container and there remain $x$ mol after the equilibrium is established, the number of moles of $PCl_3$ will be ..........

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