Question

A unit cell of sodium chloride has four formula units. The edge length of the unit cell is 0.564 nm. The density of sodium chloride is ______ g/cm³.

Options

• 2.16

• 4.56

• 6.71

• 8.23

Answer 1

A unit cell of sodium chloride has four formula units. The edge length of the unit cell is 0.564 nm. The density of sodium chloride is 2.16 g/cm³.

Explanation:

Density of NaCl = `("n" × "At.wt.")/("N"_"A" × "a"^3)`

= `(4 × 58.5)/(6.023 × 10^23 × (5.64 × 10^(-8))^3`

= 2.16 g/cm³