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Unformatted text preview: AP Chemistry – Solutions apchemsolnprac0809.doc Name: _________________________________ Date: ______________________ Period: _____ 1. An aqueous solution of ethanol, C 2 H 5 OH, that is 12.0% ethanol by weight, has a density of 0.981g/mL at 20.0 o C. The molecular mass of C 2 H 5 OH is 46.0g/mol. What is the molality of ethanol in this solution? 2. What is the mole fraction of water in the water-ethanol solution given in question 1 above? 3. What is a colligative property? Name the four colligative properties studied in this chapter. 4. Which one of the following does NOT affect the solubility of a gas in solvents? a. identity of the gas b. identity of the solvent c. pressure of the gas d. temperature e. atmospheric pressure 5. An ideal solution is formed from a mixture of the nonvolatile solute, urea (CO(NH 2 ) 2 ), and methanol (CH 3 OH). The vapor pressure of pure methanol at 20.0 o C is 89.0mmHg a. Calculate the mole fraction of urea that is obtained from mixing 6.0g of urea with 32.0g of a....
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This note was uploaded on 12/07/2011 for the course CHEM 100 taught by Professor Feebeck during the Fall '10 term at Purdue.
- Fall '10