Fall 07 Mid Term 4 MW - Midterm III Chemistry 400 Form A(MW...

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Midterm III Chemistry 400 Name ____________________________________________ Form A (MW) Please use scantron to mark your answers for questions 11 through 23 (3 points each) and show your work for questions 1 through 10. 1. The Henry's Law constant ( k ) for carbon monoxide in water at 25°C is 9.71 × 10 -4 mol/(L·atm). How many grams of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm? (6 points) 2. What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether, C 4 H 10 O, in 425 g of benzene, C 6 H 6 ? What is the mole fraction of diethyl ether? (8 points)
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3 Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile, non electrolyte solute in 275 g of hexane ( = 86.18 g/mol) at 49.6°C. P ° hexane = 400.0 torr at 49.6°C. (6 points) 4. Determine the freezing point of a solution which contains 0.31 mol of sucrose in 175 g of water. K f = 1.86°C /m (6 points)
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5. Human blood has a molar concentration of solutes of 0.30 M . What is the osmotic pressure of blood at 25°C? (4 points) 6. At 36.1 0 C, the vapor pressure of water is 41.1 torr. What is the vapor pressure at 85.5 0 C in atm? The heat of vaporization of water is 40.7 kJ/mol. (6 points)
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7. Use these data to draw a qualitative phase diagram for G
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