1. Cow's milk contains 45 g of lactose per 100 mL of milk What mass of lactose is present in 250 mL (one glass) of milk? 2. A 10% WN salt solution is used for making pickles. What mass of salt is present in 750 mL of this solution? 3. A 250 mL measuring cup of cleaning solution contains 1.2 mol of dissolved ammonia. What is the molar concentration of this solution? 4. Fish require a concentration of about 4.5 ppm (4.5 mg/L) of dissolved oxygen in water. What volume of water would contain 100 mg of oxygen? 5. What volume of concentrated, 14.6 mol/L phosphoric acid would contain 2.00 mol of solute? 6. What mass of table salt is needed to prepare 1.20 L of 5.20 mol/L solution? 7. What is the molar concentration of zinc nitrate if 94.2 g of solute is dissolved to make 2.00 L of solution