11 - Name: _ Date: _ 1. A correct statement of Henry's law...

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Name: __________________________ Date: _____________ 1. A correct statement of Henry's law is: A) the concentration of a gas in solution is inversely proportional to temperature. B) the concentration of a gas in solution is directly proportional to the mole fraction of solvent. C) the concentration of a gas in solution is independent of pressure. D) the concentration of a gas in a solution is inversely proportional to pressure. E) none of these 2. The term "proof" is defined as twice the percent by volume of pure ethanol in solution. Thus, a solution that is 95% (by volume) ethanol is 190 proof. What is the molarity of ethanol in a 92 proof ethanol/water solution? density of ethanol = 0.80 g/cm 3 density of water = 1.0 g/ cm 3 mol. wt. of ethanol = 46 A) 0.46 M B) 0.80 M C) 0.92 M D) 8.0 M E) 17 M 3. A solution containing 442.6 g of Mg(NO 3 ) 2 per liter has a density of 1.114 g/mL. The molarity of the solution is: A) 2.984 M B) 2.679 M C) 8.952 M D) 3.324 M E) none of these 4. At a given temperature, you have a mixture of benzene (vapor pressure of pure benzene = 745 torr) and toluene (vapor pressure of pure toluene = 290 torr). The mole fraction of benzene in the vapor above the solution is 0.590. Assuming ideal behavior, calculate the mole fraction of toluene in the solution. A) 0.213 B) 0.778 C) 0.641 D) 0.359 E) 0.590 Page 1
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5. When 0.795 g of NH 4 NO 3 was added to 150.0 g of water in a Styrofoam cup, the temperature dropped by 0.413 o C. The heat capacity of H 2 O is 4.18 J/g o C. Assume the specific heat of the solution equals that of pure H 2 O and that the calorimeter neither absorbs nor leaks heat. The molar heat of solution of solid NH 4 NO 3 is: A) + 261 J/mol B) + 26.1 kJ/mol C) + 2.61 kJ/mol D) –2.61 kJ/mol E) –261 J/mol 6. A 0.2 molar solution of a solute, X, in benzene, displays an osmotic pressure given by the formula π = (0.1) RT . Which of the following is most likely to be the case? A) X exists in benzene as X. B) X exists in benzene as X 2 . C) X exists in benzene dissociated into two particles. D) This solution strongly deviates from ideal behavior. E) None of these is plausible. 7. Calculate the osmotic pressure (in torr) of 6.00 L of an aqueous 0.674 M solution at 30.
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This note was uploaded on 01/15/2012 for the course CHEM 101 taught by Professor Curtis during the Spring '11 term at Austin Community College.

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11 - Name: _ Date: _ 1. A correct statement of Henry's law...

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