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1.Calculate the mass(in grams) of magnesium chloride (MgCl2) that would be needed to prepare 150 mL of a 20% by mass aqueous solution of the salt.The density of the solution is 1.1g/mL.

3. A solution is prepared by dissolving 20 mL of pure hydrogen peroxide (H2O2) in enough water to make 200 mL of solution.What is the concentration of the H2O2 solution?

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