Calculate the osmotic pressure of a solution obtained by mixing 100cm3 of 1.5% solution of urea (molar mass =60) and 100cm3 of 3.42 % solution of cane sugar (molar mass=342) at 20oC (R=0.082litre atm/degree/mol).

Moles of urea in 100 cm3 of solution = 1.5/60
Moles of cane sugar in 100 cm3 of solution = 3.42/342

Total moles = 1.5/60 + 3.42/342
 = 0.035 in 200 cm3 of solution

As osmotic pressure is a colligative property it will depend upon total moles of solute present in solution and not upon their nature. Hence,

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