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Characteristics of Equilibrium Constant

5 moles of ...

Question

$5$ moles of $P C l_{5}$ are heated in a closed vessel of $5$ litre capacity. At equilibrium $40 %$ of $P C l_{5}$ is found to be dissociated. What is the value of $K_{c}$ ?

0.266

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0.133

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2.5

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0.20

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Solution

The correct option is A $0.266$ M
$P C l_{5} ⇌ P C l_{3} + C l_{2}$
Initial concentration of $P C l_{5} = \frac{5}{5} = 1$
concentration of $P C l_{5}$ at equilibrium $= 1 - \frac{40}{100} = 0.6$

$∴$ the value of $K_{c} = \frac{0.4 * 0.4}{0.6} = 0.266 M$

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