The times of flow of dilute solutions of polystyrene in benzene through a viscometer at 25°C are given in the table below. From these data, calculate the molar mass of the polystyrene samples. Since the solutions are dilute, assume that the densities of the solutions are the same as those of pure benzene. η(benzene) = 0.601 × 10⁻³ kg m⁻¹ s ⁻¹ (0.601 cP) at 25°C.

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c/(g dm-³) t/s 0 208.2 2.22 248.1 5.00 303.4 8.00 371.8 10.00 421.3