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A lower freezing point 8 which of the following would

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a lower freezing point:
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8. Which of the following would have the lowest vapor pressure? a. 1 m glucose (C 6 H 12 O 6 ) b. 1 m MgCl 2 c. 1 m NaNO 3 d. 1 m NaBr e. pure water 9. Which would have a boiling point closest to that of 1 m NaCl? 10. Which of the following would have the lowest freezing point? 11. You need a solution that is 0.15 m in ions. How many grams of MgCl 2 must you dissolve in 400. grams of water? (Assume total dissociation of the ionic solid.) 12. What is the molar mass of a non-dissociating solid if 5.48 grams dissolved in 35.0 grams of benzene freezes at -1.39°C? The freezing point of pure benzene is 5.50°C and the freezing point depression constant K fp is -5.12 °C/ m . a. 116 g/mol b. 189 g/mol c. 245 g/mol d. 412 g/mol e. 609 g/mol
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13. What is the molar mass of a compound if 4.28 grams is dissolved in 25.0 grams of chloroform solvent to form a solution which has a boiling point of 64.00 °C? The boiling point of pure chloroform is 61.70°C and the boiling point constant, K bp is 3.63 °C/ m . 14. The osmotic pressure of blood is 7.65 atm at 37°C. How many grams of glucose (C 6 H 12 O 6 ) are needed to prepare 1.00 L of a solution for intravenous injection that has the same osmotic pressure as blood? 15. When Solution A, 0.10 M NaCl and Solution B, 0.20 M NaCl are separated by a semipermeable membrane, what occurs during osmosis? Sketch a diagram of the two solutions and indicate the direction of solvent flow before you answer the questions. 16. A research team prepared a new compound that has a molar mass of 175 g/mol. A novice chemist then prepared a solution of a new compound by dissolving 0.80 g in a small amount of water and diluting to a volume of 50.0 mL. A supervisor asked for the molality of the solution. Does the chemist have enough information to determine the molality? If so, calculate the molality. If not, explain what additional information could be determined by the chemist to complete the task in a short time.
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