To calculate the volume in mL that you need to administer for an order of 1,000 mg when the available concentration is 500 mg/2 mL, you can follow these steps:
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Determine the concentration in mg/mL: \[ \text{Concentration} = \frac{500 \text{ mg}}{2 \text{ mL}} = 250 \text{ mg/mL} \]
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Now, use the concentration to find out how many mL are needed to provide the ordered dose of 1,000 mg: \[ \text{Volume (mL)} = \frac{\text{Dose (mg)}}{\text{Concentration (mg/mL)}} \] \[ \text{Volume (mL)} = \frac{1000 \text{ mg}}{250 \text{ mg/mL}} = 4 \text{ mL} \]
Therefore, you will need to give 4 mL to administer 1,000 mg.