Question

The density of a crystal is given by the formula

Options

• `(a^3M)/(ZNA)`

• `(ZM)/(a^3NA)`

• `(NoM)/(Za^3)`

• `(a^3NA)/(Z xx M)`

Answer 1

`(ZM)/(a^3NA)`

Explanation:

Density = Mass/Volume

Density of unit cell = `"Mass of unit cells"/"Volume of unit cell"`

= `m/v`

= `(z xx m)/a^3`

= `(z xx m)/(a^2 xx N_A)`