# The Volume of the average adult lung when expanded is about $6L$ at $98.4^{\large\circ}F$. If the pressure of oxygen in inhaled air is $168mm$ of $Hg$ , calculate the mass of $O_2$ required to occupy the lung at $98.4^{\large\circ}F$.
$(a)\;2.3g\qquad(b)\;0.5g\qquad(c)\;1.67g\qquad(d)\;2.1g$