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 molality of the solution? A. 0.30 m C. 0.24 m B. 0.28 m D. 0.20 m 2. What is the boiling point of the solution? A. 80.71°C C. 80.81°C B. 80.86°C D. 80.1°C 3. What is the freezing point of the solution? A. 4.48°C C. 4.27°C B. 4.07°C D. 3.96°C

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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 molality of the solution?
C. 0.24 m
D. 0.20 m
A. 0.30 m
B. 0.28 m
2. What is the boiling point of the solution?
A. 80.71°C
C. 80.81°C
B. 80.86°C
D. 80.1°C
3. What is the freezing point of the solution?
A. 4.48°C
С. 4.27°C
В. 4.07°C
4. What is the molarity of the solution?
D. 3.96°C
A. 0.30 M
C. 0.24 M
В. 0.28 М
D. 0.20 M
5. What is the osmotic pressure of the solution?
A. 0.49 M
C. 5.77 M
В. 7.22 М
6. What is the mole fraction of naproxen in the solution?
D. 0.4 M
A. 0.98
C. 0.07
В. О.33
7. What is the mass percent of naproxen in the solution?
D. 0.02
A. 6.37%
C. 74.68%
В. 93.63%
D. 25.32%
Transcribed Image Text: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 molality of the solution? C. 0.24 m D. 0.20 m A. 0.30 m B. 0.28 m 2. What is the boiling point of the solution? A. 80.71°C C. 80.81°C B. 80.86°C D. 80.1°C 3. What is the freezing point of the solution? A. 4.48°C С. 4.27°C В. 4.07°C 4. What is the molarity of the solution? D. 3.96°C A. 0.30 M C. 0.24 M В. 0.28 М D. 0.20 M 5. What is the osmotic pressure of the solution? A. 0.49 M C. 5.77 M В. 7.22 М 6. What is the mole fraction of naproxen in the solution? D. 0.4 M A. 0.98 C. 0.07 В. О.33 7. What is the mass percent of naproxen in the solution? D. 0.02 A. 6.37% C. 74.68% В. 93.63% D. 25.32%
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