Copper crystallizer into an fcc lattice with edge length `3.61 xx 10^(-8) cm`, Show that the calculated density in in agreement with its measured value of `8.92 g cm^(3)`.

Explanation

`"Atomic mass"=("Density"xx"Av.No."xx"Volume of unit cell")/(n)` and n = 4(for f.c.c.)
`"Density"=(63.55xx4)/(6.023xx10^(23)xx(3.61xx10^(-8))^(3))=8.97g//cm^(3)`
The calculated value `8.97g//cm^(3)` is closer to given value `8.92g//cm^(3)`