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- 17. If an intravenous injection contains 20% (w/v) of mannitol, how many milliliters of the injection should be administered to provide a patient with 100 g of mannitol? 17. 500 mL1. Prepare 30 mL of a 5 mg/mL oral phenobarbital solution using phenobarbital available from the manufacturer in a 65 mg/mL solution that comes in 1-mL vials. How much stock solution will be required? 2. What mass in milligrams of potassium nitrate is present in 0.25 kg of a 500 ppm aqueous solution of KNO,?Codeine 6 mg/ mL Simple syrup qs ad 2 floz (60 mL) a. Calculate the number of grams of codeine needed b. If we have codeine 30 mg tablets in stock, how many tablets are required? c. Calculate the percentage strength and ratio strength of this preparation 2. Acetazolamide Using Acetazolamide 250 mg tabs X 10 Simple syrup qs 100 mL a. Make qs 250 mL b. Find concentration