The healthcare provider prescribes magnesium sulfate 300 mg/hour IV. The IV bag is contains magnesium sulfate 4 grams in dextrose 5% in water (DW) 500 mL. How many mL/hour should the nurse set the infusion pump? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

Convert grams to milligrams: 4 grams = 4000 mg Determine the concentration of magnesium sulfate in the solution: 4000 mg / 500 mL = 8 mg/mL Calculate the volume needed to deliver 300 mg/hour: 300 mg/hour ÷ 8 mg/mL = 37.5 mL/hour Therefore, the nurse should set the infusion pump to deliver 37.5 mL/hour.