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What weight of solute (mol. Wt. 60) is r...

What weight of solute (mol. Wt. 60) is required to dissolve in 180 g of water to reduce the vapour pressure to `4//5^(th)` of pure water ?

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`:.(P_(o)P_(S))/(P_(s))=(wxxM)/(mxxW)`
`P_(s)=(4P_(o))/(5)=m=60, w=? W=180 g, M=18`
`:.(P_(o)-(4P_(0))/(5))/((4P_(0))/(5))=(wxx18)/(60xx180)`
`:. W=(60xx180)/(4xx18)=150g`
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