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The vapour density of PCl(5) at 43K is i...

The vapour density of `PCl_(5)` at `43K` is is found to be `70.2`. Find the degree of dissociation of `PCl_(5)` at this temperature.

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The correct Answer is:
D
Theroretical vapour density of `PCl_(5)` is
`D=("molecular weight of" PCl_(5))/(2)`
`=(31+5xx35.5)/(2)`
`=208.5/2=104.25`
Observed vapour density is, `d=70.2`
`:.` Degree of dissociation `(alpha)=(104.25-70.2)/70.2=0.485`
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