A unit cell of NaCl has 4 formula units. Its edge length is 0.50 nm. Calculate the density if molar mass of NaCl = 58.5 g/mol.

Options

A. 1 `g//cm^(3)`
B. 2 `g//cm^(3)`
C. 3 `g//cm^(3)`
D. 4 `g//cm^(3)`

Answer

C

Explanation

Using formula Density `= (Z xx m)/((a^(3) xx Na))`
`D = (4 xx 58.5)/((0.5 xx 10^(7))^(3) xx 6.023 xx 10^(23))`
`= 3.1 g//cm^(3)`