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quiz04

Course Number: CHEM 144, Fall 2009

College/University: UNC Asheville

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Chem 144 Dr. George Heard Quiz #4: September 16, 2003 Name: Question 1) [4 points] The molal boiling point elevation constant of water is 0.52 C/m. What would be the boiling point of 100.0 g of water containing 45.6 g of dissolved calcium nitrate (which has a molar mass of 164.0 g/mol)? Question 2) [3 points] If the osmotic pressure of a solution of 0.020 M solution of lauryl alcohol (a nonvolatile molecular...

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144 Dr. Chem George Heard Quiz #4: September 16, 2003 Name: Question 1) [4 points] The molal boiling point elevation constant of water is 0.52 C/m. What would be the boiling point of 100.0 g of water containing 45.6 g of dissolved calcium nitrate (which has a molar mass of 164.0 g/mol)? Question 2) [3 points] If the osmotic pressure of a solution of 0.020 M solution of lauryl alcohol (a nonvolatile molecular solvent) is 316 mmHg, at what temperature (in C) was the reading taken? Question [5 3) points] The normal freezing point of CCl4 is -22.3 C, and Kfp is 29.8 C/ m. In order to determine the molar mass of caffeine, 3.50 g caffeine is dissolved in 250.0 g of CCl4. This solution has a freezing point of 20.1 C. What is the molar mass of caffeine? Question 4) [3 points] Rank the following solutions in order of increasing vapor pressure (all solutes are nonvolatile). (a) 0.20 m C4H10O (butanol) (b) 0.20 m NaCl (c) 0.20 m K2SO3 (d) pure water Answer to bonus question: 1.

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UNC Asheville - CHEM - 144
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