Chem 162, Spring 01, Test 1

Chem 162, Spring 01, Test 1 - CHEMISTRY 162 SPRING 2001...

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CHEMISTRY 162 SPRING 2001 PRACTICE EXAM I 1. Concentrated hydrofluoric acid is a 29.2 M solution of HF in water and has a density of 1.17 g/cm 3 . What is the mole fraction of HF in concentrated hydrofluoric acid? A. 0.029 B. 0.473 C. 0.578 D. 0.310 E. 0.802 2. A sample of ethylene glycol, C 2 H 6 O 2 , is dissolved in water to make a solution in which the mole fraction of ethylene glycol is 0.236. What is the molality of ethylene glycol in this solution? A. 0.66 m B. 1.89 m C. 13.8 m D. 17.2 m E. 24.7 m 3. Which of the following would you expect to be more soluble in water than in nonpolar solvents? I. C 2 H 2 II. NH 4 Cl III. NH 3 IV. CCl 4 A. I and II B. II and III C. II and IV D. I and III E. III and IV 4. Which of the following aqueous solutions should have the highest normal boiling point? A. 1.0 m sodium chloride B. 1.0 m sucrose C. 1.0 m hydrochloric acid D. 1.0 m aluminum nitrate E. 1.0 m calcium chloride
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5. Which of the following would increase the molar solubility of a gas in a liquid? A. Decrease the temperature. B. Decrease the pressure of the gas above the liquid. C. Increase the surface area of the liquid. D. Decrease the volume of the liquid. E. Increase the volume of the liquid. 6. If water is added to an aqueous NaCl solution, making the solution more dilute, then A. the boiling point of the solution will increase. B. the freezing point of the solution will decrease. C. the vapor pressure of the solution will decrease. D. the osmotic pressure of the solution will increase. E. the value of the van't Hoff factor i will increase. 7. The osmotic pressure of a solution of 2.33 g of a protein in 250 cm 3 of solution at a temperature of 298 K is 0.0147 atm. What is the molar mass of this protein? A. 6.57 x 10 4 g/mol B. 8.73 x 10 3 g/mol C. 1.55 x 10 4 g/mol D. 3.92 x 10 4 g/mol E. 3.88 x 10 3 g/mol 8. A solution is prepared by dissolving the nonvolatile nonelectrolyte solute glucose (C 6 H 12 O 6 , molar mass 180 g/mol) in water. If the mass percent of glucose in this solution is 9.70%, calculate the vapor pressure of the solution at 22
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Chem 162, Spring 01, Test 1 - CHEMISTRY 162 SPRING 2001...

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