1.

A solutionofan organic compundis prepared by dissolving34.2 g in 500 g ofwater.Calculate the molecularmass of the compoundandfreezingpoint of thesolution . Given that k_(b) for water= 0.52 K m^(-1) , b.pt of solution= 100.14^(@)C , K_(f) for water= 1.87 Km^(-1) .

Answer»


Solution :`Delta T_(B) = 100.104 - 100 = 0.104^(@)`
`M_(B) = (0.52 xx 34.2 xx 1000)/(0.14 xx 500)= 342`
`Delta T_(f) = (1.87 xx 34.2 xx 293)/(342 xx 500) = 0.374`
`therefore ` FREEZING POINT`= - 0.374^(@)C`


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