1. What is the molality of a solution that contains 13.4 grams of calcium chloride dissolved in 655 mL of
water? Density of H2O 1 g/mL
2. How many mL of hydrogen peroxide are needed to make a 12.5% solution by volume of hydrogen
peroxide if you want to make 320 mL of solution? 40 mL
3. What is the mole fraction of the solute in the solution from problem 2? *note that the density of
H2O2 is 1.45 g/mL .09
4. What is the mole fraction of the solvent in the solution from problem 2? *note that the density of
H2O is 1 g/mL .91
5. You want to create a 0.25 m Potassium Chloride (KCl) solution. You mass 5.00 grams of Potassium
Chloride. How much water is needed? .272
6. What is the molality of a solution that contains 48 grams of sodium chloride (NaCl) and 250 mL of
water?
*note: the density of water is 1 g/mL
7. What is the percentage by mass of the solution from problem 6?
19.2