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1. A 25 mL of alcohol is dissolved in water to give a total volume of 250 ml. What is the percent by volume concentration of the alcohol? 4.39% 2. What is the percentage by mass of a salt solution prepared by dissolving 16 g of salt in 80 g of solution? 30% 3. A five-peso coin has a mass of 7.4 g. How many grams of copper are found in the coin containing 70% copper by mass? 4. Sterling silver contains 92.5 % silver. If a necklace made of sterling silver weighs 18 g, what is the mass of the silver dissolved in the necklace? 5. A solution is prepared by dissolving a certain amount of solute in 400 g of water. The percentage by mass of the solute in the solution is 7.58%. Calculate the mass of solute.​

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