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)

Question

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), 25.45 atm, 11.56 atm, 29.98 atm, 30.20 atm

MARKS App · Accepted Answer

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

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