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Unformatted text preview: markowitz (am45362) – H03: Colligative Properties – mccord – (51625) 1 This printout should have 16 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points We dissolve 7.5 grams of urea (a nonelec trolyte with MW 60 g/mol) in 500 grams of water. At what temperature would the solu tion boil? 1. 99.87 ◦ C 2. 99.54 ◦ C 3. 100.13 ◦ C 4. 0.13 ◦ C 5. 100.46 ◦ C 002 10.0 points 10 grams of NaNO 3 is dissolved in 711 grams of water. What is the boiling point elevation in degrees Celsius? Note that K b for water is 0.512 ◦ C /m . Assume complete dissociation of the salt and ideal behavior of the solution. Answer in units of ◦ C. 003 10.0 points Which of the following aqueous solutions would exhibit the highest boiling point? 1. . 1 m urea 2. . 1 m CaCl 2 3. . 1 m NaCl 004 10.0 points The freezing point of an aqueous solution con taining a nonelectrolyte dissolved in 315 g of water is 1 . 8 ◦ C. How many moles of solute are present? Given that k f is 1 . 86 K · kg / mol....
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 Spring '07
 Holcombe
 Chemistry, Freezingpoint depression

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