1. What is the molarity of a sodium chloride solution, if 12.95 g of NaCl are di

Question

1. What is the molarity of a sodium chloride solution, if 12.95 g of NaCl are dissolved in enough water to make 0.200 L of solution?

2.What is the molality of a sodium chloride solution, if 10.73 g of NaCl are dissolved in 0.800 kg of water?

3.What is the mole fraction of a lithium fluoride solution prepared by dissolving 42.0 g of LiF in 0.300 kg of water.

4.What is the mass percent of a lithium fluoride in a solution prepared by dissolving 35.3 g of LiF in 0.300 kg of water

5.Calculate the freezing point for a 1.54 m solution of CCl4 in benzene.

6.Calculate the increase in the boiling point,T, for a 1.50 m solution of sucrose (dissolves as a molecule) in water.

7.Sugar is dissolved in hot water at 45oC until the mole fraction of water decreases to 0.896. The vapor pressure of pure water at this temperature is 72 torr. What is the vapor pressure (in torr) of water for this solution?

8.42.2 g of the nonvolatile solute urea (M.W. = 60.06 g/mol) is dissolved in 385 g of water at 60oC. The vapor pressure of pure water at this temperature is 149 torr. What is the equilibrium vapor pressure (in torr) of water for this solution?

Explanation / Answer

1)

moles of NaCl = 12.95 / 58.5 = 0.221

volume = 0.200 L

Molarity = moles / volume = 0.221 / 0.2

Molarity = 1.107 M

2)

moles of NaCl = 10.73 / 58.5 = 0.1834

mass of solvent = 0.800 kg

molality = moles / mass of solvent = 0.1834 / 0.8

molality = 0.229 m

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