1 1g Let us build your skills Problem Solving Time. Answer the following problems. Write your full solution on your answer sheet and box the final answer with correct units. 1. Hydrogen peroxide, H2O2, is used by some water treatment systems to remove the disagreeable odor of sulfides in drinking water. An aqueous solution of H20, prepared in the laboratory was found to have a concentration of 20.0% by mass What is the mole fraction of H2O2? 2. A sample of 0.938 g of sodium hydroxide (NaOH) is dissolved in 60.9 g of water. What is the percent by mass of NaOH in the solution? 3. Calculate the percentage by weight of NaCl, if 2.0g of NaCl is dissolved in 20 g of water 4. What is the percent by mass of 5.0 g of iron (II) sulfate dissolved in 75,0 g of water? 5. A solution is made by adding 25 mL of benzene to 80 mL of toluene. What is the percent by volume of benzene?
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