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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 gcm-3, molar mass of the substance will be-  
[AIEEE 2007]
  • a)
    90.0g mol-1
  • b)
    115.0g mol-1
  • c)
     105.0g mol-1
  • d)
    210.0 g mol-1
Correct answer is option 'D'. Can you explain this answer?
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The correct answer is option D
For isotonic solutions, the osmotic pressure is the same. When solutions do not associate, Ⅱ = CRT and isotonic solutions will have the same concentration.
Let the molar mass of substance be M. It’s molar concentration will be The molar concentration of urea solution is 
According to question,

60 = 210.0 g/mol.
Hence, the molar mass of the substance is 210.0 g/mol.
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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 gcm-3, molar mass of the substance will be- [AIEEE 2007]a)90.0g mol-1b)115.0g mol-1c)105.0g mol-1d)210.0 g mol-1Correct answer is option 'D'. Can you explain this answer?
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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 gcm-3, molar mass of the substance will be- [AIEEE 2007]a)90.0g mol-1b)115.0g mol-1c)105.0g mol-1d)210.0 g mol-1Correct answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about 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 gcm-3, molar mass of the substance will be- [AIEEE 2007]a)90.0g mol-1b)115.0g mol-1c)105.0g mol-1d)210.0 g mol-1Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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 gcm-3, molar mass of the substance will be- [AIEEE 2007]a)90.0g mol-1b)115.0g mol-1c)105.0g mol-1d)210.0 g mol-1Correct answer is option 'D'. Can you explain this answer?.
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