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## Homework Statement

A standard cylinder of oxygen used in a hospital has gauge pressure = 2.0E3 psi (1.38E4 kPa) and

volume = 16 L (0.016 m3) at T = 295 K. How long will the cylinder last if the flow rate, measured at atmospheric pressure, is

constant at 1.8 L/min?

## Homework Equations

PV=nRT

n=m/M

flowrate=volume/time

## The Attempt at a Solution

I assume it's not as simple as 16/1.8?

I used PV=(m/M)RT to solve for mass, but that got me no where.