An atomic substance A of molar mass 12 g mol^-1 has a cubic crystal structure with edge length of 300 pm. The no. of atoms present in one unit cell…

An atomic substance $\displaystyle A$ of molar mass $\displaystyle 12 \mathrm{~g} \mathrm{~mol}^{-1}$ has a cubic crystal structure with edge length of $\displaystyle 300$ pm . The no. of atoms present in one unit cell of $\displaystyle A$ is $\displaystyle \_\_\_\_$. (Nearest integer) Given the density of $\displaystyle A$ is $\displaystyle 3.0 \mathrm{~g} \mathrm{~mL}^{-1}$ and $\displaystyle \mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23} \mathrm{~mol}^{-1}$