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1. A mixture of alcohol and water is 28.00% (v/v) alcohol. How many L of the mixture do I need in order to have 250.0 mL of alcohol?

2. A mixture of salt and water is 28.0 g salt and 60.0 g water. What is the % (m/m) salt?

3. A salt water mixture is 33.0% (w/w) walt. (The w/w refers to weight / weight or mass / mass). If there are 300.0 g salt in the mixture, what is the total weight of the mixture?

4. A sand-water mixture weights 38.6 g. If the mixture is 15.0% (m/m) water, how many grams of water are in the mixture?

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