A solution of urea is isotonic with 12g/L glucose solution. What is the concentration of urea?

4 g/L 12 g/L 16 g/L 1 g/L

4 g/L

πurea = πglucose \(\frac{n_1}{V}\) = \(\frac{n_2}{V}\) \(\frac{x}{60}\) = \(\frac{12}{180}\)        (mol. mass of urea = 60, mol. mass of glucose = 180) x = 4g/L