A 5.25% solution of a substance is isotonic with 1.5% solution of urea in the same solvent. If the densities of both the solutions are assumed to be equal to 1g cm-3 the molar mass of the substance will be
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a
115 g mol-1
b
105 g mol-1
c
210 mol-1
d
90 g mol-1
answer is C.
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Detailed Solution
Assuming the unknown solute and urea neither associate nor dissociate in aq. sol.For isotonic solutions , C1=C2 Molar mass of unknown solute " X " =210g/mole