# A unit cell of sodium chloride has four formula units.The edge length of the unit cell is 0.564nm.What is the density of sodium chloride?

$\begin{array}{1 1}2.16g/cm^3\\3.16g/cm^3\\4.16g/cm^3\\5.16g/cm^3\end{array}$

## 1 Answer

Density of $NaCl=\large\frac{n\times \text{Atomic weight}}{\text{Avogadro's no}\times a^3}$
$\Rightarrow \large\frac{4\times 58.5}{6.023\times 10^{23}\times (5.64\times 10^{-8})^3}$
$\Rightarrow 2.16g/cm^3$
answered Aug 1, 2014

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