Activity 2: Expressing Concentrations Quantitatively! Directions: Read and analyze the given situations below then solve what is asked in each problem by showing the complete process of computation.
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?
2. What is the percentage by mass of a salt solution prepared by dissolving 16 g of salt in 80 g of solution?
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.​