A nurse is to deliver an infusion of 5% dextrose in 0.45% sodium chloride at a rate of 83 mL/hr. How long will it take to infuse 1,000 mL?

To determine how long it will take to infuse 1,000 mL at a rate of 83 mL/hr, you need to use the formula for calculating time based on volume and rate:

Time = Volume / Rate.

Substituting the given values:

Time = 1,000 mL / 83 mL/hr.

When you perform the calculation, you divide 1,000 by 83, which results in approximately 12.05 hours. Since time typically needs to be rounded to the nearest whole number for practical purposes in clinical settings, this rounds down to about 12 hours.

This aligns with the correct answer provided, demonstrating a clear understanding of calculating infusion time based on the given volume and rate. Additionally, recognizing that infusion rates often do not lead to fractional hours in practical applications completes the rationale behind this answer choice.