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35 solutions

The Colligative Properties

Q. 108. mg of an unknown protein are dissolved in enough solvent to make 5.00 mL of solution. The osmotic pressure of this solution is measured to be 0.0264 atm at 25.0 °C. Calculate the molar mass of the protein. Round your answer to 3 significant digits.

Solved • Jul 21, 2019

The Colligative Properties

Q. A solution is prepared by dissolving 50.0 g of sucrose, C12H22O11, in 250. g of water at 25°C. What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg? A) 24.0 mm Hg B) 19.8 mm Hg C) 0.247 mm Hg D) 23.5 mm Hg

Solved • Jul 15, 2019

The Colligative Properties

Q. A 150.0 mL sample of an aqueous solution at 25°C contains 15.2 mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 8.44 torr, what is the molar mass of the unknown compound? A) 195 g/mol B) 294 g/mol C) 448 g/mol D) 223 g/mol E) 341 g/mol

Solved • Jul 15, 2019

The Colligative Properties

Q. Calculate the vapor pressure of a solution made by dissolving 109 grams of glucose (molar mass = 180.2 g/mol) in 920.0 ml of water at 25 °C. The vapor pressure of pure water at 25 °C is 23.76 mm Hg. Assume the density of the solution is 1.00 g/ml. A) 22.98 mm Hg B) 23.76 mm Hg C) 0.605 mm Hg D) 0.278 mm Hg E) 23.48 mm Hg

Solved • Jul 15, 2019

The Colligative Properties

Q. Urea (CO(NH2))2; molar mass 60.056 g/mo, is a metabolic waste molecule produced by animals. Urea is a white solid with no vapor pressure at 25C. A student dissolves some urea in to 43.5 g of ethanol(CH3CH2OH) molar mass 46.069 g/mol) at 25C. The concentration of the solution 0.51m. The normal boiling point of ethanol is 78.24C and the boiling point elevation cosntant of ethanol is 1.22C/m. The vapor pressure of ethanol at 25C at 59.022mmHg

Solved • Jul 16, 2019

The Colligative Properties

Q. Lysozyme is an enzyme that cleaves bacterial cell walls. A sample of lysozyme extracted from egg white has a molar mass of 13,930 g. A quantity of 0.700 g of this enzyme is dissolved in 1.30 × 102 g of water at 25°C. Calculate the vapor-pressure lowering, the depression in freezing point, the elevation in boiling point, and the osmotic pressure of this solution. (The vapor pressure of water at 25°C is 23.76 mmHg.) Report each of your answers to 3 significant figures.

Solved • Jul 10, 2019

The Colligative Properties

Q. The vapor pressure of a solution is ________ than the vapor pressure of the pure solvent because _________. Choose all that apply.

Solved • Jul 13, 2019