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Equilibrium osmotic pressure heads h measured at 22 degrees C for a series of solutions of a polystyrene sample in toluene are tabulated below: Assuming that the densities of toluene and polystyrene at 22 degrees C are, respectively, 0.867 g cm^-3 and 1.05 g cm^-3, calculate the following. a. The number-average molar mass for the sample of polystyrene. b. An estimate of the Flory-Huggins polystyrene-toluene interaction parameter.

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