Mass of glucose ( C _6 H _ 12 O _6 ) required to be dissolved to prepare one litre of its solution which is isotonic with 15 ~g ~L ^ -1 solution of urea ( NH _3 CONH _2 ) is (Given: Molar mass in g mol ^ -1 C : 12, H : 1, O : 16, ~N : 14 )

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Correct answer: D. 45 g

For isotonic solutions [osmotic pressure must be equal] _1= _2 C _1 RT = C _2 RT C _1= C _2 m 180 1 = 15 60 1 ( ~m is the mass of glucose) m= 180 4 =45 ~g

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