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112608

# 112608 - Osmotic Pressure Osmotic Pressure Osmotic Pressure...

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Osmotic Pressure

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Osmotic Pressure
Osmotic Pressure y To determine the molar mass of a certain protein, 0.00100 g of it was dissolved in enough water to make 1.00 mL of solution. The osmotic pressure of this solution was found to be 112 torr at 25 o C. Calculate the molar mass of the protein.

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van’t Hoff Factor Jacobus Henricus van’t Hoff Dutch Chemist 1852-1911
van’t Hoff Factor

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van’t Hoff Factor y The observed osmotic pressure for a 0.10 M solution of Fe(NH 4 ) 2 (SO 4 ) 2 at 25 o C is 10.8 atm. Compare expected and experimental values of i .
Vapor Pressures of Solutions y Predict the vapor pressure of a solution prepared by mixing 35.o g solid Na 2 SO 4 with 175 g water at 25 o C. The vapor pressure of pure water at 25 o C is 23.76 torr.

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Practice Problem y A solution is prepared by mixing 0.0300 mol of CH 2 Cl 2 and 0.0500 mol of CH 2 Br 2 at 25 o C. Assuming the solution is ideal, calculate the composition of the vapor pressures of CH 2 Cl 2 and CH 2 Br 2 in the vapor (in terms of mole fractions) at 25 o C. At 25 o C, the vapor pressures of pure CH 2 Cl 2 and pure CH 2 Br 2 are 133 and 11.4 torr, respectively.
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112608 - Osmotic Pressure Osmotic Pressure Osmotic Pressure...

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