2) The osmotic pressure of solutions of polystyrene in toluene were measured at 25 °C and...
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 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
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.
A) Calculate the osmotic pressure of a solution containing 16.75 mg of hemoglobin in 15.7 mL of solution at 22 ∘C . The molar mass of hemoglobin is 6.5×104 g/mol. B) A 2.400×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.4 mL . The density...
A polymer of large molar mass is dissolved in the organic solvent dimethylformamide (C3H7NO) at 25 °C, and the resulting solution rises to a final height of 17.5 cm above the level of the pure solvent, as solvent molecules pass through a semipermeable membrane into the solution. If the solution contains 5.03 g polymer per liter, calculate the molar mass of the polymer. Take the density of the solution to be 0.944 g cm-3. Molar mass polymer =
A polymer of large molar mass is dissolved in the organic solvent chloroform (CHCl3) at 25 °C, and the resulting solution rises to a final height of 7.99 cm above the level of the pure solvent, as solvent molecules pass through a semipermeable membrane into the solution. If the solution contains 3.97 g polymer per liter, calculate the molar mass of the polymer. Take the density of the solution to be 1.48 g cm-3.