<prompt> You are administering anesthesia in a location that does not have an oxygen supply line. The E-cylinder that you are using reads 500 psig. Your oxygen flows are 10 Lmin. Approximately how long does it take for your E-cylinder to empty5 minutes15 minutes50 minutes100 minutes  <response>: A full E-cylinder of oxygen contains 600 L of gas at a pressure of 2000 psig. Using Boyle law P1 V1 P2 V2 the volume of the paially depleted cylinder can be calculated, V2 P1 V1 P2 or V2 P1 P2 x V1 . There is a quaer tank left, and therefore a quaer of 600 L, or 150 L. At 10 Lmin, this volume of gas would last 15 minutes. 