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Solutions — Easy JEE chemistry MCQ

The boiling point elevation of a solution containing 3 g of urea (molar mass = 60 g/mol) in 100 g of water is: (Kb for water = 0.52 K kg/mol)
  1. A. 0.26 K
  2. B. 0.52 K
  3. C. 0.78 K
  4. D. 1.04 K

Solution

Molality m = (3/60)/(100/1000) = 0.5 mol/kg. ΔTb = Kb × m = 0.52 × 0.5 = 0.26 K.

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The boiling point elevation of a solution containing 3 g of urea (molar mass = 60 g/mol) in 100 g of water is: (Kb for water = 0.52 K kg/mol)
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