A 2.24 litre cylinder containing $O_2$ gas at $27^{\large\circ}C$ and 2 atm is found to develop a leakage was repaired , the pressure dropped to 100cm of Hg at $27^{\large\circ}C$ . The number of moles of gas escaped out during leakage is :

Question

$(a)\;0.06\qquad(b)\;0.05\qquad(c)\;0.07\qquad(d)\;0.08$