SolutionMediumBloom L3
Question
A 5.25 % solution of a substance is isotonic with a 1.5% solution of urea (molar mass = 60 g mol-1) in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0 g cm-3, molar mass of the substance will be
Options
A.90.0 g mol-1
B.115.0 g mol-1
C.105.0 g mol-1
D.210.0 g mol-1
Solution
Solutions with the same osmotic pressure are isotonic
Let the molar mass of the substance be M
π1 = C1RT = C2RT = π2
So, C1 = C2
As density of the solutions are same
So
M =
= 210
Hence (4) is correct
Let the molar mass of the substance be M
π1 = C1RT = C2RT = π2
So, C1 = C2
As density of the solutions are same
So
M =
= 210Hence (4) is correct
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