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

Question

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

Monjur Alahi

6 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

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`

6 views Answered 2023-02-05 15:29