if a solution contains 4% of mannitol how many milliliters of the solution should be administered to provide?

Question

80 grams of mannitol to the patient?

Answer 1

4% mannitol contains 40 mg/ml of the drug so to get 80 mg you need 2 ml. Multiple this by 1000 to get 80,000 mg (or 80 grams)

Answer 2

When a solution is denoted in the terms of X% it generally is indicative of a wt/vol ratio. For a 4% solution that means there are 4 grams reagent (mannitol in this case) per 100ml of solution. Calculating how much solution (S) you need to administer 80g mannitol total is done as follows:

S= g final mannitol desired/ concentration of mannitol solution
S= 80g mannitol final / (4 g mannitol/100ml solution)
S= 2000 ml solution total

Answer 3

Look
You have 4% mannitol ?!
Means 4g of mannitol in 100ml of solution (H2O)
You want to give patient 80g
How to solve it?!!
4g --->100ml
80g ---> ?? ml
And by cross multiplication
(100 x 80)/4 = 2000ml of water
So 80g of mannitol needs 2000ml (=2L) of water
OK