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The vapour pressure of pure benzeen at 5...

The vapour pressure of pure benzeen at `50^(@)C` is 268 torr. How many mol of non-volatile solute per mol 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:
D
`(268-167)/(268) = X_("solute") = 0.377`
`0.623` mole wt benzene contains `0.377` mole of solute.
So 1 mole will contain `= (0.377)/(0.623) = 0.605`
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