Exam 11: Solutions and Their Properties

The number of moles of ions in 25 mL of 2.0 M Na₂SO₄ is ________ moles.

Drawing (1)shows a system in which an equilibrium exists between dissolved and undissolved gas particles at P = 1 atm.According to Henry's law,if the pressure is decreased to 0.5 atm and equilibrium is restored,which drawing (2)-(5)best represents the equilibrium at 0.5 atm?

At a given temperature the vapor pressures of benzene and toluene are 183 mm Hg and 59.2 mm Hg,respectively.Calculate the total vapor pressure over a solution of benzene and toluene with X_benzene = 0.600.

-Which drawing above represents the system with the second lowest entropy?

Molarity is defined as moles of solute per

A person is considered legally intoxicated with a blood alcohol level of 80 mg/dL.Assuming that blood plasma has a density of 1.025 g/mL,what is this concentration expressed in parts per million?

A 2.00 M solution of CaCl₂ in water has a density of 1.17 g/mL.What is the mole fraction of CaCl₂?

The osmotic pressure of a 0.10 M solution of sucrose,C₁₂H₂₂O₁₁ will be ________ (equal to,greater than,less than)the osmotic pressure of a 0.10 M solution of fructose,C₆H₁₂O₆.

Cocaine,C₁₇H₂₁NO₄,in urine can be confirmed by mass spectroscopy at a concentration of 150 ng/mL.Assuming a urine density of 1.025 g/mL,what is this concentration expressed as molality?

A solution is prepared by dissolving 171 g of CdCl₂ in enough water to make 250.0 mL of solution.If the density of the solution is 1.556 g/mL,what is the molarity of the solution?

Naproxen is a commercially important anti-inflammatory agent that can be isolated from the thyroid gland.A solution of 1.138 g of naproxen in 25.00 g benzene has an osmotic pressure of 4.00 atm at 20°C.The density of benzene is 0.8787 g/mL at this temperature.Calculate the molar mass of naproxen,assuming it remains intact upon dissolution and the density of the solution equals the density of pure benzene.

When KI is dissolved in water,the major forces overcome are ________ forces in the solute and ________ forces in the solvent,and the major forces created between solute and solvent particles are ________ forces.

Fresh air contains approximately 400 ppm CO₂,whereas the breath of an intoxicated person contains about 4 percent CO₂.The amount of CO₂ in the breath of an intoxicated person is ________ times the amount of CO₂ in fresh air.

A solution is 2.25% by weight NaHCO₃.How many grams of NaHCO₃ are in 450.0 g of solution?

Although there are exceptions,which is most likely to be true for the dissolving of a solid in a liquid?

At 25°C the vapor pressures of benzene and toluene are 96.0 mm Hg and 30.5 mm Hg,respectively.The vapor pressure of a solution that has a 0.50 mole fraction of toluene will have a vapor pressure ________ (equal to,greater than,less than)30.5 mm Hg.

In most liquid solutions,the component present in the larger amount is called the

Which cation in each set is expected to have the larger (more negative)hydration energy? I.Be²⁺ or Ca²⁺ II.Rb⁺ or Zn²⁺

The solubility of gaseous solutes in liquid solvents is greater when the

A solution of 62.4 g of insulin in enough water to make 1.000 L of solution has an osmotic pressure of 0.305 atm at 25°C.Based on these data,what is the molar mass of insulin?