A nurse is preparing to administer potassium 0.4 mEq/kg/hr to a newborn who weighs 6.7 lb. Available is potassium 10 mEq in 0.9% sodium chloride 100 mL. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Step 1: Convert newborn weight to kilograms 6.7 lb ÷ 2.2 lb/kg = 3.045 kg. Step 2: Calculate the potassium dosage per hour 0.4 mEq/kg/hr × 3.045 kg = 1.218 mEq/hr. Step 3: Calculate the infusion rate (1.218 mEq/hr ÷ 10 mEq) × 100 mL = 12.18 mL/hr. Final Answer: 12.2 mL/hr (rounded to the nearest tenth).