[单选题]
Two liters of a perfect gas awj;)9 s(wt2d (.w po gjolx8a;2gwuodre emp i6ipc3-/ 9tdl 2m3)+xlwyejx;zs at $0 \; ^{\circ}C$ and 1 atm. If the gas is nitrogen, $N_2$, determine the mass of the gas.
A. $2.5 \; g$
B. $2.7 \; g$
C. $2.9 \; g$
D. $3.1 \; g$
