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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%`.

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The correct Answer is:
5
5
`P_(S)=(80/100)P^(0),w=?,m=40`
`W=114g,M_(C_(s)H_(18))=114`
`(P^(0)-P_(s))/(P_(s))=(wxxM)/(mxxW)`
Or `(P^(@)-(80/100)P^(@))/((80/100)P^(@))=(wxx114)/(40xx114)`
`w=10g`
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