Determine the average molecular weight of a polymer

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Question- By measuring the osmotic pressure of a polymer solution one can determine the average molecular weight of a polymer. A 0.1455 g sample of polystyrene was dissolved in chloroform using a 10 mL volumetric flask. At a temperature of 25 °C the osmotic pressure was 3.140 torr. What was the molecular weight of the polystyrene?

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