1. Calculate the mass (in grams) of magnesium chloride (MgCl 2 ) that would be needed to prepare 150 mL of a 20% by mass aqueous solution of the salt. The density of the solution is 1.1 g/mL. 2. Calculate the percent by mass of the solution containing 8.60 g of salt in 95.0 g of solution. 3. A solution is prepared by dissolving 20 mL of pure hydrogen peroxide (H 2 O 2 ) in enough water to make 200 mL of solution. What is the concentration of the H 2 O 2 solution?

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