Direction: Solve the following Problem. Show your solution by the given number.

1. If I make a solution by adding water to 75mL of ethanol until the total volume of the solution is 375mL, what is the percent by volume of ethanol in the solution?

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2. Rubbing alcohol is sold as a 70% (v/v) solution of isopropyl alcohol in water. What volume of isopropyl alcohol is used to make 500mL of rubbing alcohol?

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3. A bottle of hydrogen peroxide also known as agua oxigenada is labeled 3% (v/v). How many mL of agua oxigenada are in a 400mL bottle of this solution?

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4. A solution of benzene and toluene was prepared by adding toluene to benzene until the total volume becomes 135mL. By volume, the solution is 30.0% benzene. How much benzene, in mL, is in the solution?
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5. What is the percent by volume of ethanol in a solution that contains 45 mL of ethanol dissolved in 125 mL of water?

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