Trying to calculate the density of LiNbO3 from perovskite

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Homework Statement


upload_2017-3-6_17-49-48.png

This is what I have so far. I'm using the theoretical density formula for crystaline solids
big_thumb.jpg

but the actual theoretical density is supposed to be 4.644g/cm^3

Am I missing something? I'm using the right formula, am I not?
 
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First, from your formula I get 3.85 g/cm3, not 3.5. And there are not 5 "LiNbO3" units in the unit cell. Count them again.
 
you have three different types of atoms each one has different atomic weight.
 

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