Physics

Problem

12.4 An oxygen cylinder of volume 30 litre has an initial gauge pressure of 15 atm and a temperature of

27{ }^{\circ} \mathrm{C}

. After some oxygen is withdrawn from the cylinder, the gauge pressure drops to 11 atm and its temperature drops to

17^{\circ} \mathrm{C}

. Estimate the mass of oxygen taken out of the cylinder (

R=8.31 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}

, molecular mass of

\mathrm{O}_{2}=32 \mathrm{u}