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How much PCl(5) must be added to one lit...

How much `PCl_(5)` must be added to one litre volume reaction vessel at `250^(@)C` in order to obtain a concentration of `0.1` mole of `Cl_(2),K_(c)` for `PCl_(5)hArrPCl_(3)+Cl_(2)` is `0.0414" mol dm"^(-3)` at `250^(@)C`.

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The correct Answer is:
`0.341` moles `PCl_(5)`
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