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The vapour pressure of pure benzene C(6)...

The vapour pressure of pure benzene `C_(6)H_(6)` at `50^(@)C` is `268 "torr"`. How many moles of non-volatile solute per mole of benzene is required to prepare a solution of benzene having a vapour pressure of `167 "torr"` at `50^(@)C`?

A

0.377

B

0.605

C

0.623

D

0.395

Text Solution

Verified by Experts

The correct Answer is:
A
`p=P_(B)^(@)chi_(B)` (B= Benzene acts as solvent)
`chi_(B) =167/268 =0.623`
`chi_(solute)=1-chi_(B)=0.377`
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