The osmotic pressure of a fraction of poly (vinyl chloride) in a ketone solvent was measured at 25°C. The density of the solvent (which is virtually equal to the density of the solution) was 0.798 g cm3. Calculate the molar mass and the osmotic virial coefficient, B, of the fraction from the following data:

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c/(g/10° cm') 0.088 0.600 0.600 1.000 0,200 0.400 0.48 1.2 1.86 2.76 3.88 h/cm