[单选题]
Two liters of a perfe0e6vj)yrans exs9a6. ipo k+;w d )bw( s:ohc,bcaxvqc f2+81ct gas are at $0 \; ^{\circ}C$ and 1 atm. If the gas is nitrogen, $N_2$, determine the number of molecules.
A. $3.5 \times 10^{22}$
B. $5.3 \times 10^{22}$
C. $4.7 \times 10^{22}$
D. $7.4 \times 10^{22}$
