1.

The aqueous solutions, containing respectively 7.5 g of urea (mol. Wt = 60) and 42.75 g substance X in 100 g of water freeze at the same temperature. Calculate the molar mass of X.

Answer»


SOLUTION :`DeltaT_(F)=K_(f)xxm." As "DeltaT_(f)` is same for the TWO solution, their molalities will be equal, i.e.,
`(7.5)/(60)XX(1000)/(100)=(42.75)/(M)xx(1000)/(10) or M=342.`


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