Final answer:
The client is receiving approximately 21% FiO2.
Step-by-step explanation:
The client is receiving oxygen at a flow rate of 5L/min. To determine the approximate amount of FiO2 the client is receiving, we need to know the fraction of inspired oxygen in the delivered gas. FiO2 is usually expressed as a percentage.
At sea level, room air has an FiO2 of approximately 21%. This means that the air we breathe contains about 21% oxygen.
Therefore, the client in this case is receiving approximately 21% FiO2.