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Exam 12: Physical Properties of Solutions

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Question 41

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At 10°C one volume of water dissolves 3.10 volumes of chlorine gas at 1.00 atm pressure.What is the Henry's Law constant in mol/L·atm?

A) 0.043
B) 0.13
C) 3.1
D) 3.8
E) 36.

F) A) and B)
G) A) and C)

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Question 42

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Calculate the molality of a 20.0% by mass ammonium sulfate (NH₄) ₂SO₄ solution.The density of the solution is 1.117 g/mL.

A) 0.150 m
B) 1.51 m
C) 1.70 m
D) 1.89 m
E) 2.10 m

F) D) and E)
G) A) and D)

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Question 43

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A solution is prepared by adding 40.3 g of Mg(NO₃)₂ to 127 g of water.Calculate the mole fraction and molality of magnesium nitrate in this solution.

Plasma is the fluid portion of blood.The concentration of acetylsalicylic acid (aspirin, C₉H₈O₄, molar mass = 180.g/mol)in your plasma is found to be 2.99 × 10^-4 M after you take two tablets of aspirin.If the volume of your plasma is 5.85 L, how many grams of aspirin are in your blood? (Assume that the density of plasma is 1.00 g/mL.)

How many grams of sucrose (C₁₂H₂₂O₁₁, 342.3 g/mol) would be needed to make 2.5 L of a solution with an osmotic pressure of 14 atm at 25°C? (R = 0.0821 L.atm/K.mol)

The concentration of nitrogen in water at 25°C was determined to be 7.2 × 10^-6 M.Calculate the partial pressure of nitrogen at the surface of the water in mmHg.The Henry's law constant for nitrogen gas at 25°C is 6.8 × 10^-4 mol/L·atm?

What is the molality of a 0.142 M Na₃PO₄(aq)solution that has a density of 1.015 g/mL?

Which of the following gases is expected to have a higher solubility in water than what is predicted using Henry's law?

The vapor pressure of a solution depends on the chemical nature of the solvent

The vapor pressure of water at 45.0 °C is 71.93 mmHg.Calculate the vapor pressure of a solution of 1.25m Al(ClO₃) ₃ at this temperature (assume 100% dissociation)

Which of the following aqueous solutions has the highest boiling point (assume 100% dissociation for all soluble ionic compounds) ?

Calculate the molality of a solution containing 14.3 g of NaCl in 42.2 g of water.

Which of the following liquids would make a good solvent for iodine, I₂?

List the following solutions in order of decreasing melting point: 0.20m glycerol, 0.11m Sc(NO₃)₃, 0.15m K₂CO₃

What is the molarity and molality of a solution that is 10.00 % by mass potassium hydrogen carbonate (KHCO₃, 100.11 g/mol)and has a density of 1.0650 g/mL?

What is the percent by mass of a Na₂SO₄ solution in water with a mole fraction of Na₂SO₄, X = 0.350 ?

What is the molarity of a solution that is 5.50 % by mass oxalic acid (C₂H₂O₄)and has a density of 1.0244 g/mL?

In how many grams of water should 25.31 g of potassium nitrate (KNO₃) be dissolved to prepare a 0.1982 m solution?

What is the osmotic pressure of a solution that contains 13.7 g of propyl alcohol (C₃H₇OH) dissolved in enough water to make 500.mL of solution at 27°C?

Calculate the boiling point of a 4.5 m solution of Na₂SO₄ in water (assume 100% dissociation, K_b (H₂O) = 0.52 °C/m)