Select  the quantity of ${\mathrm{NO}}_2$ with highest mass:

$100\mathrm{amu}=\left(100\right)\left(\frac{1\mathrm{g}}{6.022\times {10}^{23}}\right)=1.66\times {10}^{-22}\mathrm{g}$

Mass of $7.0\times {10}^{22}\text{ molecules }=\frac{7.0\times {10}^{22}}{6.022\times {10}^{23}}\times 46\mathrm{g}=5.35\mathrm{g}$

Mass of $8.0\times {10}^{-1}\mathrm{mol}=0.8\times 46\mathrm{g}=36.8\mathrm{g}$