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A hexagonal close-packed lattic can be r...

A hexagonal close-packed lattic can be represented by figures (a) and (b) below. If `c=asqrt((8)/(3))=1.633a` , there is an atom at each corner of the unit cell and another atom which can be located by moving one-third the distance along the diagonal of the rhombus base, starting at the lower left hand corner and moving perpendicularly upward by c/2 . Mg crystallizes in this lattice and has a density of `1.74 g cm^(-3)`.
What is the volume of unit cell?

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