A 5 % 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 gcm ⁻³ molar mass of the substance will be____

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Quantrex Academy · Accepted Answer

Correct answer: 200

Solution with the same osmotic pressure are isotonic. Let the molar mass of the substance be M . ₁= ₂C₁ R T=C₂ R TC₁=C₂ As density are also same So, 5 M = 1.5 60 M= 5 60 1.5 =200 ~g ~mol ⁻¹

A 5 % 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 gcm ⁻³ molar mass of the substance will be____

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