12 gram of urea is dissolved in 2 litre solution at 300K temperatures how many grams of NaCl should be dissolved in 10 litre solution so that it becomes iso-osmotic with urea solution?
a. 7.31.
b. 29.25
c. 5.85
d. 19.5

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Given that the solutions are isotonicπ1 = π2π = CRT  = W2M2V × RTW2M2V × RTurea = W2M2V × RTNaCl1260 × 2 × RTurea = W258.5 × 10 × RTNaClSince gas constant R and T are equal 1260 × 2 urea = W258.5 × 10NaClW2 = 58.5 × 10 × 1260 × 2  = 58.5 g 

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