Calculate the molecular weight of a small protein if a 0.25-g sample dissolved in 180 mL of water has an osmotic pressure of 9.2 mmHg at 25°C. (R = 0.0821 L · atm/(K · mol))

An aqueous solution of 1.00 M ammonia (NH3) has a density of 0.900 g/mL. What is its concentration in molality (mol/kg)?

When 16.3 g of an organic compound known to be 57.15% C, 4.8% H, and 38.06% O by mass is dissolved in 700.7 g of water, the freezing point is −0.343⁢ ∘C. The normal freezing point of water is 0⁢ ∘C. What is the molecular formula for the organic compound? Assume that the organic compound is a molecular solid and does not ionize in water. ?f values for various solvents are given in the colligative constants table.

A 2.25-mg sample of dioctyl phthalate (C24H38O4), a plasticizer, is dissolved in H2O to give 630. mL of solution.What is the concentration of dioctyl phthalate in parts per billion (ppb)?

A beverage contains tartic acid, H2C4H4O6, a sustance obtained from grapes during winemaking. If the beverage is 0.3292 M tartaric acid, what is the molal concentration? The density of the solution is 1.061 g/ml.

What is the osmotic pressure of a solution at 22.5 oC when 3.5462 g of CoCl 2 (MM = 129.839 g/mol) is dissolved to make 325.0 mL of solution?

[16] At a checkpoint a white powdery substance was found in a car and suspected to be cocaine (303.35 g/mol). When a 2.0-g sample of the white powder is dissolved in 500-mL of water, the resulting osmotic pressure at 300K is found to be 217 mmHg. Determine the molar mass of the substance. Should the driver of the vehicle be arrested for possession of cocaine? Justify your response. [17] Arrange the following solutions in order of decreasing freezing point: 0.10 m Na3PO4, 0.35 m NaCl, 0.20 m MoCb, 0.15m Pac

gohil      A physician studying a type of hemoglobin formed during a fatal disease dissolves 21.5mg of the protein in water at 5.0 °C to make 1.50mL of solution to measure its osmotic pressure. At equilibrium, the solution has an osmotic pressure of 3.61 torr. What is the molar mass of the hemoglobin?

If the solubility of copper (i) sulphide is 7.4 x 10-17 mol/L, what is its Ksp? Please format your answer like the following example: 1.2x10^-15

4. A 6.06-gram sample of a compound is dissolved in 250. grams of benzene. The freezing point of this solution is 1.02°C below that of pure benzene. What is the molar mass of this compound? (Note: Kę for benzene = 5.12°C/m.)