1.

The freezing point of the aqueous solution of urea is -0.6^(@)C. How much urea should be added to 3 kg water to get such solution ? (K_(f)=1.5^(@)"C Kg. mol"^(-1))

Answer»

72 gram
6.0 gram
3.6 gram
2.4 gram

Solution :`Delta T = K_(F).m=K_(f)xx ((1000xx W)/(M xx W_(o)))`
`W=(Delta TXX M xx W_(o))/(K_(f)xx1000)`
`therefore W=(0.6xx60xx3000)/(1.5xx1000)=72` gram.


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