An 80% He:20% O2 mixture is being delivered to an asthmatic patient by a nonrebreather mask through an oxygen flow meter set at 8 L/min. What is the actual flow delivered to the patient?
a. 10 L/min
b. 12 L/min
c. 14 L/min
d. 18 L/min
ANS: C
The conversion factor for an 80:20 heliox mixture is 1.8. 8 ? 1.8 = 14.4 L/min.
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