1.

The solutions containing 6 g of urea (molecular mass =60) per dm_(3) of water and another containing 9 g of solute A per dm^(3) of water freeze at the same temp. The molecular mass of A is

Answer»

12
90
54
150

Solution :Molality of urea solution =`6/(60 xx 1KG)=0.1M`
"As freezing POINT of both the solution are same they must have same molalities".
"Hence for solute A",
`"Molecular MASS"="mass"/("molality" xx 1 kg)=9/(0.1 xx 1 )=90`


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