A home care patient inquires about how long her portable liquid oxygen system, currently weighing 30 lb, will last if she uses 3 L/min. The manufacturer says the weight of an empty con-tainer is 8 lb. Her system will last for _____ day(s) and _____ hours
a. 1; 18 c. 4; 21
b. 2; 9 d. 8; 12
ANS: A
First subtract 8 lb from 30 lb = 22 lb. Convert 22 lb/2.5 lb/L = 8.8 L. 8.8 L ? 860 (liter of liquid oxygen multiplied by 860 equals the liters of gaseous oxygen) = 7568 L. Then divide by liter flow. 7568/3 L/min = 2522 min = 1 day 18 hours.
Health Professions
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