The edge length of $NaCl$ unit cell is $500\; pm$. What is the density of $NaCl$ in $g/cm^3 ?$ [NA = 6.02 x 1023, Na = 23.0, Cl = 35.5 a.m.u.]

Question

$\begin{array}{1 1} (a)\;2.19 \;g/cm^3 \\ (b)\;3.00 \;g/cm^3 \\ (c)\;3.12 \;g/cm^3 \\ (d)\;4.00\; g/cm^3 \end{array}$