A 2.80 M aqueous solution of LiCl has a density of 1.0626 g/mL. If the total mass of the solution is 68.0 g, what masses of solute and solvent are present?
mass of LiCl:
g solute
mass of water:
g solvent
2. β-Galactosidase (β-gal) is a hydrolase enzyme that catalyzes the hydrolysis of β-galactosides into monosaccharides. A 0.562 g sample of β-galactosidase is dissolved in water to make 0.169 L of solution, and the osmotic pressure of the solution at 25 °C is found to be 0.708 mbar. Calculate the molecular mass of β-galactosidase.
molecular mass:
g/mol
3. Calculate the freezing point of an 8.75 m aqueous solution of fructose. Freezing point constants can be found in the list of colligative constants.
Tf=
°C
4. Given that the vapor pressure of water is 17.54 Torr at 20 °C, calculate the vapor-pressure lowering, ΔP, of an aqueous solution that is 2.00 m in sucrose (C12H22O11).
ΔP=
Torr
Calculate the vapor-pressure lowering, ΔP, of an aqueous solution that is 2.00 m in aluminum chloride. Assume 100% dissociation for electrolytes.
ΔP=
Torr
5. A 0.670 m aqueous solution of KBr has a total mass of 73.0 g. What masses of solute and solvent are present?
mass of KBr:
g KBr
mass of water:
g H2O