Q.

Sea water is 3.5% by mass of a salt and has a density 1.04 g cm-3 at 293 K. Assuming the salt to be sodium chloride, calculate the osmotic pressure of sea water. Assume complete ionisation of the salt -

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a

26.93 atm

b

29.93 atm

c

28.93 atm

d

27.93 atm

answer is B.

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Detailed Solution

Mass of NaCl = 3.5 gNo. of moles =3.558.5Actual number of moles of particles of solute in solution =2×3.558.5d=mV V=mdVolume of solution =1001.04×1000litre π=2×3.558.5×1.04×1000100×0.0821×293=29.93 atm.
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