13.The osmotic pressure measurement of a 0.22 g/100 cm3 solution of poly(vinyl chloride) in toluene at 25Centigrade, difference of 7.1 mm in the heights of the solution and solvent levels. (a) What is the osmotic pressure (atm) of the solution ? (b) If the second virial coefficient for poly(vinyl chloride) in toluene is 200 cm3/g, calculate Mn of the polymer. [Density of toluene at 25Centigrade =0.867 g/cm3.]

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