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Chemistry / Chemistry 11 / Chapter 12 / Problem 64P

Chemistry | 11th Edition | ISBN: 9780073402680 | Authors: Raymond Chang

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?A solution containing 0.8330 g of a polymer of unknown structure in 170.0 mL of an

Chapter 12, Problem 64P

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QUESTION:

A solution containing 0.8330 g of a polymer of unknown structure in 170.0 mL of an organic solvent was found to have osmotic pressure of 5.20 mmHg at 25°C. Determine the molar mass of the polymer.

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QUESTION:

A solution containing 0.8330 g of a polymer of unknown structure in 170.0 mL of an organic solvent was found to have osmotic pressure of 5.20 mmHg at 25°C. Determine the molar mass of the polymer.

ANSWER:

Step 1 of 2

The osmotic pressure of a solution is the pressure required to stop osmosis.

The osmotic pressure of a solution is given by

where is the molarity of solution, is the gas constant , and is the absolute temperature. The osmotic pressure, , is expressed in atm. Because osmotic pressure measurements are carried out at constant temperature, we express the concentration in terms of the more convenient units of molarity rather than molality.

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