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 isA. 12B. 90C. 54D. 150

The solutions containing 6 g of urea (molecular mass =60) per `dm_(3)`

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 isA. 12B. 90C. 54D. 150
Answer» Correct Answer - B 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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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 isA. 12B. 90C. 54D. 150

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