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From the website above we know that there are 8 Al atoms in every unit cell.
So to find the mass of Al in the unit cell, we need to find the mass of an Al atom (in grams) and multiply it by eight.
1 atom x (27.0 g / 6.02 x 1023 atoms = mass of 1 Al atom in grams
Then, since there are 8 atoms in a face centered unit cell:
8 atoms x (mass of 1 Al atom in grams) = mass of Al atoms in one unit cell
Since we know the density of aluminum and we know the mass of a unit
cell, we can calculate the volume of the unit cell using the density
Density = mass/ volume
4.16 g = mass of Al atoms in a unit cell / volume in cm3
I am still doing the calculations I will supplement the answer
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