1.

A unit 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 ?

Answer»

`1.2 g CM^(-3)`
`2.16 g cm^(-3)`
`3.64 g cm^(-3)`
`4.56 g cm^(-3)`

Solution :Density ` = (Z xx M )/( a^(3) xx N_(A))`
`= ( 4 xx 58.5 )/( ( 5.64 xx 10^(-8) cm)^(3) xx 6.022 xx 10^(23))`
`= 2.16g cm^(-3)`


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