Aunit dose of levalbuterol hcl contains 3.0 ml in a 0.0417% concentration. how many unit doses are needed in order to obtain 10mg of the active ingredient?

8 unit doses

Step-by-step explanation:

A 0.0417% concentration means that 100 mL of solution contains 0.0417 grams = 41.7 mg of the active ingredient.  

Cross-multiplying  

100 mL 41.7 mg

    x mL 10 mg

100/x = 41.7/10 > x = 1000/41.7 = 23.9808 = 24 mL rounding to the nearest integer.

As a  unit dose of Levalbuterol HCL contains 3.0 mL,  

we need 24/3 = 8 unit doses to obtain 10 mg of the active substance.