How many grams of drug are in 120ml of a 0.4% solution?

To find out how many grams of drug are in 120 ml of a 0.4% solution, it's important to understand what a 0.4% solution means. A 0.4% solution indicates that there are 0.4 grams of the drug for every 100 ml of solution.

Here's how to calculate the amount of drug in 120 ml:

1. Start with the percentage concentration. Since 0.4% indicates the amount of drug in 100 ml, you first establish how many grams are present in 120 ml.

2. Set up a proportion using the known values:

[

\text{Amount of drug in grams} = \left( \frac{0.4 \text{ grams}}{100 \text{ ml}} \right) \times 120 \text{ ml}

]

3. Perform the calculation:

[

\text{Amount of drug in grams} = \left( 0.4 \times 120 \right) / 100 = 0.48 \text{ grams}

]

Therefore, the calculation shows that there are 0.48 grams of the drug in 120 ml of a 0.