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Unformatted text preview: Tufts University Chem 2 Summer 2008 Practice Exam 1a Answer Key 1 . Solution of sodium chloride that is isotonic with the human blood is 0.90 % by mass (d = 1.01 g/mL). a) Calculate the osmotic pressure (in atm) of blood in equilibrium with pure water at 37 C. Assume full dissociation of NaCl. b) Calculate the concentration of glucose (in g/L) in a solution isotonic with human blood. The formula of glucose is C 6 H 12 O 6 . c) Why is it important that the solutions for intravenous injections should be isotonic with blood? 2. At 298 K, the vapor pressure of benzene (C 6 H 6 ) is 94.4 torr, and that of chloroform (CHCl 3 ) is 172.0 torr. How many moles of benzene should be added to 1.00 mol of chloroform to create a mixture with a total vapor pressure of 100.0 torr at 298 K? 3. 150.0 mL of 0.200 M solution of AgNO 3 were mixed with 100.0 mL of 0.100 M solution of Na 2 CO 3 . a) How many grams of a precipitate will form? b) Estimate the freezing point of the solution above the precipitate (K f for water is 1.86 C/m). 4 . In the reaction P 4 (g) 2P 2 (g), the equilibrium constant K p = 0.500 atm at 1052 C. The total pressure of an equilibrium mixture of P 4 (g) and P 2 (g) is 6.00 atm. (g) is 6....
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This note was uploaded on 07/16/2008 for the course CHEMISTRY 002 taught by Professor Kraytov during the Summer '08 term at Tufts.
- Summer '08