How many grams of drugs are in 15ml of a 0.25% solution?

To find the amount of drug in grams within a 15 ml solution of a 0.25% concentration, it is useful to first understand what a percentage solution represents. A 0.25% solution means that there are 0.25 grams of drug per 100 ml of solution.

To solve for the number of grams in 15 ml, we can use a proportion based on the percentage concentration:

1. Calculate grams per ml:

[

0.25 \text{ grams} \div 100 \text{ ml} = 0.0025 \text{ grams/ml}

]

2. Find the total grams in 15 ml:

[

0.0025 \text{ grams/ml} \times 15 \text{ ml} = 0.0375 \text{ grams}

]

This calculation clearly shows that in 15 ml of a 0.25% solution, there are 0.0375 grams of the drug present. The correct calculation reflects the definition of percentage concentration and demonstrates the relationship between volume and mass in this specific context. Therefore, the chosen answer accurately represents the mathematical solution to the problem.