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Benzene (C(6)H(6),78g//mol)and toluene (...

Benzene `(C_(6)H_(6),78g//mol)`and toluene `(C_(7)H_(8),92g//mol)`from an ideal solution. At `60^@C`the vapour pressure of pure benzene and pure toluene are`0.575`atm and`0.184`,respectively . The mole fraction of benzene in solution of these two chemicals that has a vapour pressure of `0.350`atm at`60^@C`

A

`0.154`

B

`0.690`

C

`0.486`

D

`0.190`

Text Solution

Verified by Experts

The correct Answer is:
A
`0.35=0.507xxX_(B)+0.184xxX_(t)…(1)`
`X_(B)+X_(t)=1 …(2)`
on solving equation (1)and(2), we get
`X_(B)=0.514`
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