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AP EAMCET202022 Sep 2020Morning ShiftChemistrySome Basic Concepts of ChemistryActual

Find the molarity of the 5 molal urea solution, whose density is 1.3 ~g / mL (given, molecular weight of urea is 60.06 ~g / mol )

Options

  1. A>5 M
  2. B=5 M
  3. C< 5 M
  4. DCan't be predicted

Correct answer

B. =5 M

Step-by-step solution

5 molal urea solution (d=1.3 ~g / mL )1 ~kg of solvent contains 5 moles of urea. Means 1000 ~g water contains 300 ~g of urea. Molarity of 1300 ~g urea solution contains 300 ~g urea will be M_ urea = ( 300 60 ) 1000 ( 1300 1.3 ) =5.0 Hence, the correct option is (2).

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