Final answer:
To calculate the hourly rate for a 250 mL infusion of 0.9% sodium chloride over 30 minutes, you multiply the per-minute rate of 8.33 mL by 60 minutes to get an hourly rate of 500 mL/hr.
Step-by-step explanation:
The question asks to calculate the hourly rate for an intravenous infusion of a 0.9% sodium chloride (saline) solution. To find this, one must convert the milliliters per minute into an hourly rate. Since 250 mL is to be infused over 30 minutes, we can use the following steps:
First, find the rate in milliliters per minute (mL/min):
250 mL / 30 min = 8.33 mL/min
Then, convert this rate to an hourly rate by multiplying by 60 minutes per hour:
8.33 mL/min × 60 min/hr = 499.8 mL/hr
Therefore, the nurse should set the infusion device to an hourly rate of 500 mL/hr, which is the closest standard setting on most infusion devices.