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Calculate the mass of a non-volatile sol...

Calculate the mass of a non-volatile solute ( molecular mass `40`) which should be dissolved in `114 g` octane to reduce its vapour pressure to `80%`.

Text Solution

Verified by Experts

According ot Raoult's Law
`(P_(A)^(@)-P_(S))/P_(S)=n_(B)/n_(A)=W_(B)/M_(B)xxM_(A)/W_(A)`
`"Let"P_(A)^(@)=1 atm, P_(S)=0.8 atm , P_(A)^(@)-P_(S)=0.2atmM_(B)=40g mol^(-1),W_(A)=114g, M_(A)(C_(8)H(18))=114 g mol^(-1)`
`W_(B)=((P_(A)^(@)-P_(S)))/P_(S)xx(M_(B)xxW_(A))/M_(A)`
`((0.2atm))/((0.8 atm))xx((40g mol^(-1))xx(114g))/((114g mol^(-1)))=10.0g`
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