Ideal Gas Equation

2025 1 question

1. An oxygen cylinder of volume $30\text{ litre}$ has $18.20\text{ moles}$ of oxygen. After some oxygen is withdrawn from the cylinder, its gauge pressure drops to $11\text{ atmospheric pressure}$ at temperature $27^\circ\text{C}$. The mass of the oxygen withdrawn from the cylinder is nearly equal to:[Given: $R = \frac{100}{12}\text{ J mol}^{-1}\text{K}^{-1}$, molecular mass of $O_2 = 32$, $1\text{ atm pressure} = 1.01 \times 10^5\text{ N/m}^2$]