An oxygen cylinder of volume 30 litre has 18.20 moles of oxygen. After some oxygen is withdrawn from the cylinder, its gauge pressure drops to 11…

An oxygen cylinder of volume $\displaystyle 30$ litre has $\displaystyle 18.20$ moles of oxygen. After some oxygen is withdrawn from the cylinder, its gauge pressure drops to $\displaystyle 11$ atmospheric pressure at temperature $\displaystyle 27$°C. The mass of the oxygen withdrawn from the cylinder is nearly equal to : [Given, $\displaystyle R=\frac{100}{12} J_{m o l}{ }^{-1} K^{-1}$, and molecular mass of $\displaystyle O_2=32$, $\displaystyle 1$ atm pressure $\displaystyle =1.01 \times 10^5 \mathrm{~N} / \mathrm{m}$ ]