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The mass of a non-volatile solute (molar...

The mass of a non-volatile solute (molar mass 80 g `mol^(-1)` ) which should be dissolved in 92g of toluene to reduce its vapour pressure to `90%`

Text Solution

Verified by Experts

`(Delta P)/(P^(@))=X_(2)`
`(100-90)/(100)=(n_(2))/(n_(1)+n_(2))`
`(1)/(10)=(n_(2))/(n_(1)+n_(2))`
`(n_(2))/(n_(1)+n_(2))=10`
`(n_(1))/(n_(2))+1 =10 " " [n_(1)=(92)/(92)=1]`
`(1)/(n_(2))=9`
`n_(2)=(1)/(9)`
`(W_(2))/(M_(2))=(1)/(9)`
`W_(2)=(M_(2))/(9)=(80)/(9)=8.89 g`
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