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OpenStudy (anonymous):
As a solid, Cr adopts a body-centered cubic unit cell. How many unit cells are present per cubic centimeter of Cr?
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OpenStudy (taramgrant0543664):
The density of Cr is 7.15g/cm^3 so: 7.15g x [ 6.02E23atoms/52g ] = 8.28E22 atoms. A body centered cubic unit cell contains 2 atoms. (8 corners x 1/8 + 1 in the center = 2) 8.28E22atoms x 1 unit cell/2 atoms = 4.14E22 unit cells are in 1 cm^3
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