A nurse is preparing to administer magnesium sulfate 1 g/hr via continuous IV infusion to a client. Available is magnesium sulfate 40 g in 0.9% sodium chloride 1,000 mL. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Determine the concentration of the available solution in grams per milliliter (g/mL). Available concentration: 40 g in 1000 mL Concentration (g/mL) = 40 g/1000 mL = 0.04 g/mL. Calculate the infusion rate in milliliters per hour (mL/hr). Ordered rate: 1 g/hr Infusion rate (mL/hr) = Desired Dose (g/hr) / Concentration (g/mL) = 1 g/hr/0.04 g/mL = 25 mL/hr.