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A unit of cell of sodium chloride has fo...

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

Text Solution

Verified by Experts

`rho = (Z_(eff)xxM_(w))/(a^(3)xxN_(A)xx10^(-30))`
where `a` is in pm `(1 nm = 10^(3)"pm"), Z_(eff)` for `NaCl = 4`
`= (4xx58.5)/((0.564xx10^(3))^(3)xx(6.023xx10^(23))xx10^(-30))g cm^(-3)`
`= 2.165 g cm^(-3)`
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