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Reaction Quotient

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Question

The numerical value of $d / D$ when $α = 0$ for $P C l_{5} ⇌ P C l_{3} + C l_{2}$ ; where $d$ are vapour density of equilibrium mixture and $D$ is vapour density of $P C l_{5}$ .

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Solution

When the degree of dissociation $α$ for $P C l_{5} ⇌ P C l_{3} + C l_{2}$ is zero, the equilibrium mixture only consists of $P C l_{5}$ .
The vapor density of the equilibrium mixture will be equal to the vapor density of $P C l_{5}$ .
Hence, $d = D$ and $\frac{d}{D} = 1$

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