2) The osmotic pressure of solutions of polystyrene in toluene were measured at 25 °C and...
The osmotic pressure exerted by a 0.487-g sample of the polymer polystyrene in 41.06 mL of benzene at 25 °C is capable of supporting a column of solution (d = 0.88 g/mL) 5.9 mm in height. What is the molar mass of the polystyrene? Report the answer in kiloDaltons (abbreviated kD or kDa), but without units, to the nearest integer kD. 1kD = 1000 g/mol.
Q3. At 20 °C, the osmotic pressure of a polycarbonate was measured in chlorobenzene solution with the following results: Concentration (g/L) 1.95 2.93 3.915.86 Height of chlorobenzene (cm 0.20 0.36 0.53 0.98 Solvent density = 1.10 g/cm, polymer density = 1.20 g/cm3] Estimate the number average molecular weight Mn [Rz 8314 x 107 erg mol-1KY. (10 marks)
The molar mass of an enzyme was determined by dissolving it in water measuring the osmotic pressure at 20oC and extrapolating the data to zero concentration. The following data for the height of the column, containing the solution, and the concentration, were used: c/ mg cm-3 3.221 4.618 5.112 6.722 h/cm 5.746 8.238 9.119 11.990 Calculate the molar mass of the enzyme. Hint: Begin by expressing the equation given the osmotic pressure in terms of the height of the solution,...
The osmotic pressure of an aqueous solution of a certain protein was measured in order to determine the protein’s molar mass. The solution contained 3.50-g of protein dissolved in sufficient water to form 5.00-L of solution. The osmotic pressure of the solution at 25oC was found to be 1.54-mmHg. (Hint: Remember to convert mmHg to atm) Calculate the molar mass of the protein.
A 214 mL solution containing 23 g of a protein in toluene had an osmotic pressure of 0.053 atm at 27 oC. What is the molar mass (in g/mol) of the protein? Only enter a numerical value rounded to the nearest whole number in the answer box below. Do NOT type in the unit (g/mol). 2) An NaCl solution is prepared by dissolving 20.0 g NaCl in 150.0 g of water at 25°C. What is the vapor pressure of the...
A 249−mL benzene solution containing 2.35 g of an organic polymer has an osmotic pressure of 7.91 mm Hg at 19°C. Calculate the molar mass of the polymer.
A 279−mL benzene solution containing 2.79 g of an organic polymer has an osmotic pressure of 8.19 mm Hg at 11°C. Calculate the molar mass of the polymer.
Calculate the osmotic pressure at 298 K of the solutions that contain: 10.5 g of MgCl_2 in 150 mL of solution. 0.650 M NaCI solution. 7.5 % glucose (non-electrolyte) by mass in water. Density of solution is 1.01 g mL^-1
1-Calculate the vapor pressure of a solution of 0.34 mol of cholesterol in 4.4 mol of toluene at 32°C. Pure toluene has a vapor pressure of 41 torr at 32°C. (Assume ideal behavior.) 2-The freezing point of benzene is 5.5°C. What is the freezing point of a solution of 3.60 g of naphthalene (C10H8) in 655 g of benzene (Kf of benzene = 4.90°C/m)? 3-In a study designed to prepare new gasoline-resistant coatings, a polymer chemist dissolves 6.015 g poly(vinyl...
The osmotic pressure of 1.88 × 10−2 M solutions of CaCl2 and urea at 25°C are 1.13 and 0.459 atm, respectively. Calculate the van't Hoff factor for the CaCl2 solution.