Question

The intravenous dosage of mannitol is 1.5g/kg, administered as a 15% mv solution. How many ml of the solution should be administered to a person with a body mass of 85kg?

Answer 1

How many grams mannitol do you need for an 85 kg person? That will be 85 kg x (1.5 g mannitol/1 kg) = ?? g mannitol. Note how the kg unit cancels to leave unit of g mannitol. Then, you have a 15% m/v solution. That is 15 g mannitol/100 mL solution.
127.5 g mannitol x (100 mL/15 g mannitol) = ??mL. Again, note g mannitol cancels to leave the unit you want which is mL.

Answer 2

850mL

Answer 3

682mL