Chromium forms cubic crystals whose unit cell has an edge length of 288.5 pm. The density...

Chromium forms cubic crystals whose unit cell has an edge length of 288.5 pm. The density of the metal is 7.20 g/cm3. The atomic weight of Cr is 51.996 amu.
a) Calculate the number of atoms in a unit cell, assuming all atoms are at lattice points.
b) What type of cubic lattice does chromium have?
c) Calculate the radius of the Cr atom.
d) Calculate the empty volume of the cell.

Since I have the edge length, I'm pretty sure I cube that for volume and convert that to cm. Because I also have the density, I can use my calculated volume to find the mass. I also know the equation for this problem involves Avogado's number (6.022x10^-23) I just don't know how to find the answers to these questions, only an idea how to begin solving.

Can anyone help? Unfortunately there is no answer key so I can't even check if I'm right!

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queen_honey_blossom answered 7 months ago

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