1.

A solution of urea (mol. Mass "56 g mol"^(-1)) boils at 100.18^(@)C at the atmospheric pressure. If K_(f) and K_(b) for water are "1.86 and 0.512 K kg mol"^(-1) respectively, the above solution will freeze at

Answer»

`-6.54^(@)C`
`-0.654^(@)C`
`6.54^(@)C`
`0.654^(@)C`

Solution : `DeltaT_(b)=K_(b)xxm therefore0.18=0.512xxm`
`or m = 0.18//0,512`
`DeltaT_(F)=K_(f)xxm=1.86xx(0.18)/(0.512)=0.654`
`therefore""T_(f)=-0.654^(@)C`


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