Final answer:
The total time needed to infuse 500 ml of D5W at an infusion rate of 25 ml/hr is 20 hours.
Step-by-step explanation:
The total infusion time needed to infuse 500 ml of d5w at 25ml/hr is calculated by dividing the total volume of fluid to be infused by the infusion rate. In this case, it is:
Total Volume / Infusion Rate = Infusion Time
500 ml / 25 ml/hr = 20 hours
Therefore, the infusion is needed to run for 20 hours to deliver the 500 ml of D5W. The total time needed to infuse 500 ml of D5W at an infusion rate of 25 ml/hr is 20 hours.