What is the volume in mL for a dose of 250 mg if the concentration is 100 mg/5 mL?

To determine the volume in mL for a dose of 250 mg when the concentration is 100 mg per 5 mL, you should start by calculating how many milliliters are required to provide the desired dose.

First, find the concentration expressed per mL. Since the concentration is 100 mg in 5 mL, you can calculate the concentration per mL by dividing:

[

\text{Concentration per mL} = \frac{100 \text{ mg}}{5 \text{ mL}} = 20 \text{ mg/mL}

]

Now that you have the concentration of the solution, you can determine how many mL are needed to achieve a 250 mg dose. To find this, divide the desired dose (250 mg) by the concentration per mL (20 mg/mL):

[

\text{Volume in mL} = \frac{250 \text{ mg}}{20 \text{ mg/mL}} = 12.5 \text{ mL}

]

This calculation shows that the required volume to administer a dose of 250 mg at the given concentration is 12.5 mL. Thus, the correct answer reflects that calculation