soln2practice - CHEM 2B Solutions and Colligative...

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CHEM 2B: Solutions and Colligative Properties Clemens 1. Calculate the vapor pressure of a 1.0% by mass aqueous solution of ethylene glycol (HOCH 2 CH 2 OH) at 0.0 o C. The vapor pressure of water at this temperature is 4.58 mmHg. 2. how many grams of sucrose must be added to 50.0g of water to lower the vapor pressure of water at 25 o C by 2.56mmHg? the vapor pressure of water at this temperature is 23.79 mmHg. 3. Calculate the freezing point and boiling point of a solution of 100.g of ethylene glycol (MM=62g/mol) in 900.g of water. K f = 1.86 o C/m and K b = 0.51 o C/m for water. 4. When 0.500g of vitamin K is disoolved in 10.0g of camphor, the freezing point of
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Unformatted text preview: the solution is lowered by 4.43K. Calculate the molar mass of vitamin K. Kf (camphor) =40.0K/m. 5. How many grams of sucrose must be dissolved in 1555g of water to lower the freezing point to -4.5 o C? . K f = 1.86 o C/m 6. The osmotic pressure of 1.00g of a polymer in 100.mL of solution is 4.07 torr at 25 o C. What is the molar mass of the polymer? 7. Please make sure that you can read/interpret an enthalpy diagram for calculating lattice energy. I didn’t put a practice question like this on your practice exam, but I still expect you to be able to calculate the lattice energy for a substance and draw an enthalpy diagram for it....
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