Final answer:
The nurse will administer 1.5 milliliters of Methergine.
Step-by-step explanation:
To determine the number of milliliters of Methergine that the nurse will administer, we can use the formula:
Dose (mg) = Volume (mL) x Concentration (mg/mL)
Given that the dose is 0.3 mg, and the concentration is 0.2 mg/mL, we can rearrange the formula:
Volume (mL) = Dose (mg) / Concentration (mg/mL)
Substituting the values, we get:
Volume (mL) = 0.3 mg / 0.2 mg/mL
Volume (mL) = 1.5 mL
Therefore, the nurse will administer 1.5 milliliters of Methergine.