1.

The vapour pressuress of pure solvent and solution are 120 mm and 108 mm respectively. The mole fraction of the solvent in the solution is

Answer»

0.1
0.9
120/108
1.08

Solution :According to RAOUT's
`(P_(1)^(0)-P)/p_(1)^(0)=X_(2)` (MOLE FRACTION of solute)
`(120-108)/120=X_(2)=0.1`
Mole fraction of SOLVENT `=1-X_(2)=1-0.1=0.9`


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