Sea water is 3.5% by mass of common salt and has a density 1.04 g c m - 3 at 293 K. Assuming the salt to be sodium chloride, then osmotic pressure of sea water will be (assume complete ionisation of the salt)

Step-by-step solution

Let mass of solution be 100 g Volume of solution = M a s s D e n s i t y = 100 1.04 = 96.154 mL = 0.096 L w B = 3.5 g M B = 58.5 g mo l - 1 (molar mass of NaCl) For complete ionisation of NaCl, van't Hoff factor will be '2'. i = 2 we know, π = i C R T = i n V R T = 2 × 3.5 × 0.0821 × 293 58.5 × 0.096 = 29.98 atm