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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 + + Br89.8%...
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 Fall '08
 Suggs

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