1.

A solution of urea (mol. mass 60g 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 kg mol^(-1) respectively the above solution will freeze at

Answer»

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

Solution :`DELTA T_(b)=0.18 , Delta T_(b)=m K_(b)`
`(0.18)/(Delta T_(f))=(mK_(b))/(m K_(f)) , (0.18xx1.86)/(0.512)=Delta T_(f) , Delta T_(f)=0.653`
`T^(+)-T_(s)=0.653 , T_(s)=0-0.653^(@)C , T_(s)=-0.653^(@)C`


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