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MHT CET202124 Sep 2021Morning ShiftChemistrySolutionsActual

The solution containing 6 ~g urea (molar mass 60 ) per dm ^3 of water and another solution containing 9 ~g of solute A per dm ^3 water freezes at same temperature. What is molar mass of A?

Options

  1. A90
  2. B180
  3. C54
  4. D120

Correct answer

A. 90

Step-by-step solution

aligned & ( T _ i )₁= ( T _ f )₂ & ~m ₁= m ₂ & ~m = molality, 1 dm ^3=1 ~L =1000 ml H ₂ O & 1000 ml H ₂ O =1000 ~g H ₂ O & m = mol / M Mass of H ₂ O & 6 / 60 1 = 9 / M _ A 1 & M _ A = 60 9 6 =90 aligned

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