An aqueous solution has a normal boiling point of 10 3.0 degree C. What is the freezing point of this solution? For water = 0.51 degree C/m and Kf = 1.86 degree C/m. Assuming that sea water is a 3.5 wt % solution of NaCl in water, calculate its osmotic pressure at 20 degree C. The density of a 3.5% NaCl solution at 20 degree C is 1.023 g/mL.