We are being asked for the density of Na2O, given the unit cell edge length of 5.55 Å
Looking at the illustration, Na2O has face centered cubic structure.
Recall that the face-centered cubic lattice contains an atom in each of the faces of the cube and an atom in each of the corners.
It looks like this:
There are 4 atoms in a unit cell for a Face Centered Cubic structure (z=4).
The unit cell edge length is 5.55 Å . Determine the density of Na2O.
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