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Unformatted text preview: C 5 H 10 . What is the lowering of the vapor pressure of pentane in this solution? The vapor pressure of the pure liquids at 25 C are 451 torr for pentane and 321 torr for cyclopentane. 161 torr 7. When 1.150 grams of an unknown electrolyte dissolves in 10.0 grams of water, the solution freezes at -2.16 C. What is the molecular weight of the unknown compound? K f for water is 1.86 C/m. 99.1 g/mol 8. The osmotic pressure of 1.00 L of an aqueous solution of a nonelectrolyte solute is 1.17 atm at 0.00 C. The density of the solution is 1.09 g/mL. The chemical formula of the nonelectrolyte is C 3 H 6 O 3 . What is the % m/m of the nonelectrolyte in the solution? 0.431% m/m 9. Which solution would produce the lowest freezing point? 0.075 m sodium sulfate 10. A 0.0490 m aqueous NaBr solution freezes at -0.173 C. What is the apparent percent dissociation if NaBr in this solution? K f = 1.86 C/m for water NaBr Na + + Br-89.8%...
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- Fall '08