Naproxen (C14H1403) is a commercially important anti-inflammatory agent that can be isolated from the thyroid gland. A solution of 1.837 g of naproxen in 27.0 g of benzene (C6H6) is prepared at 20°C. The density of benzene at this temperature is 0.8787 g/mL. Assume that naproxen remains intact upon dissolution and the density of the solution equals the density of pure benzene. Use the following data: MM naproxen= 230 g/mol; MM benzene= 78 g/mol; R=0.08206 L-atm/ mol-K; For benzene : kb= 2.53°C kg/mol ; kf= 5.12°C kg/mol; Boiling point= 80.1°C; Freezing point= 5.5°C. 1. What is the molarity of the solution? A. 0.30 M B. 0.28 M C. 0.24 M D. 0.20 M 2. What is the osmotic pressure of the solution? A. 0.49 M B. 7.22 M C. 5.77 M D. 0.4 M 3. What is the mole fraction of naproxen in the solution? A. 0.98 B. 0.33 C. 0.07 D. 0.02 4. What is the mass percent of naproxen in the solution? A. 6.37% B. 93.63% C. 74.68°C D. 25.32%

Naproxen (C14H1403) is a commercially important anti-inflammatory agent that can be isolated from the thyroid gland. A solution of 1.837 g of naproxen in 27.0 g of benzene (C6H6) is prepared at 20°C. The density of benzene at this temperature is 0.8787 g/mL. Assume that naproxen remains intact upon dissolution and the density of the solution equals the density of pure benzene. Use the following data: MM naproxen= 230 g/mol; MM benzene= 78 g/mol; R=0.08206 L-atm/ mol-K; For benzene : kb= 2.53°C kg/mol ; kf= 5.12°C kg/mol; Boiling point= 80.1°C; Freezing point= 5.5°C. 1. What is the molarity of the solution? A. 0.30 M B. 0.28 M C. 0.24 M D. 0.20 M 2. What is the osmotic pressure of the solution? A. 0.49 M B. 7.22 M C. 5.77 M D. 0.4 M 3. What is the mole fraction of naproxen in the solution? A. 0.98 B. 0.33 C. 0.07 D. 0.02 4. What is the mass percent of naproxen in the solution? A. 6.37% B. 93.63% C. 74.68°C D. 25.32%

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter10: Properties Of Solutions

Section: Chapter Questions

Problem 5ALQ: You have read that adding a solute to a solvent can both increase the boiling point and decrease the...

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