Multiple choice

Calculate the molarity when density of a solution prepared by dissolving 210 g of urea (mol. mass = 60 u) in 1000 g of water is 1.25 g/mL.

  1. 3.62 M

  2. 2.92 M

  3. 0.82 M

  4. 4.02 M

  5. 5.61 M
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A Correct answer
Explanation

Molarity of a solution (M) = n/V
Where n = number of moles of urea = 210/60 = 3.5 molV = volume of the solution = mass of solution / density of solution= (210 + 1000) g/1.25 g mL-1 = 968 mL = 0.968 L. Therefore, molarity (M) = 3.5 mol/0.968 L = 3.62 mol L-1

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