Because cyclohexane and cyclopentane are both

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Because cyclohexane and cyclopentane are both nonpolar hydrocarbons of similar size and with similar intermolecular forces, we would expect them to form an ideal solution (no deviation). 021 4.0points Which of the following pairs have a van’t Hoff i factor of 2? 1. magnesium sulfate and ethylene glycol 2. sodium sulfate and potassium chloride 3. sodium chloride and magnesium sulfate correct 4. glucose and sodium chloride 5. perchloric acid and barium hydroxide Explanation: 022(part1of3)4.0points Consider the following pressure diagram for a binary liquid containing A and B. 0 1 x A 20 torr 70 torr If 9 mol of A and 6 mol of B are mixed, what is the vapor pressure of B? 1. 20 torr 2. 49 torr 3. 41 torr 4. 70 torr 5. 8 torr correct Explanation: The mole fraction of A is x A = mol A total mol = 9 mol 9 mol + 6 mol = 0 . 6 . 0 1 0 . 6 70 torr 8 torr 023(part2of3)4.0points What is the corresponding vapor pressure of A? 1. 70 torr 2. 41 torr correct 3. 20 torr 4. 8 torr 5. 49 torr Explanation: 0 1 0 . 6 70 torr 41 torr
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casey (rmc2555) – Homework 3 – holcombe – (51395) 8 024(part3of3)4.0points What is the corresponding total vapor pres- sure? 1. 8 torr 2. 70 torr 3. 20 torr 4. 41 torr 5. 49 torr correct Explanation: 0 1 0 . 6 70 torr 49 torr 025 4.0points Which of the following statements regard- ing colligative properties is/are true? I) Pure liquid water exhibits a lower freez- ing point than a solution of magnesium chloride in water; II) For completely soluble compounds that do not ionize in solution, the van’t Hoff factor i = 1; III) Osmotic pressure is pressure exerted on a semipermeable membrane between so- lutions with different concentrations of solutes. 1. I, II, III 2. II, III correct 3. I, II 4. I only 5. I, III 6. III only 7. II only Explanation: Both II and III are true, but I is false, since salt depresses the freezing point of a solvent.
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