Boyle's Law?

Question

I need help with this problem:

Oxygen used in repiratory therapy is stored at room temperature under a pressure of 150 atm in gas cylinders with a volume of 60.0 L

If the oxygen flow to the patient is adjusted to 8.00 L/ min, at room temp and 750.0 mmHg, how long will the tank of gas last?

Thanks in advance!!!

Answer 1

Boyles law is PV = k or P1V1 = P2V2.
(150 atm x 60 L)/0.987atm =9118 L

9118 L x 1min/8L = 1140 min
1140 x 1hr/60 min = 19 hr