Final answer:
The achievable FiO2 with simple face masks on a flow rate of 5-10L/min is 35-50%.
Step-by-step explanation:
The achievable FiO2 (Fraction of Inspired Oxygen) with simple face masks on a flow rate of 5-10L/min is b. 35-50%.
Simple face masks deliver a fixed concentration of oxygen to the patient, typically ranging from 35-50% FiO2 at a flow rate of 5-10L/min. These masks cover the nose and mouth and have vents that allow exhaled air to escape.
To calculate the precise FiO2, a respiratory therapist or doctor can use a device called an oxygen analyzer, which measures the oxygen concentration in the inspired air.