# AP Chem

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Sorry, I have one other question. How would I go about solving this problem?

What fraction of the total volume of a closet packed structure is occupied by atoms? What fraction of the total volume of a simple cubic structure is occupied by atoms?

Do i need to just plug in examples? I'm not positive on how to go about solving this

• AP Chem -

sorry, forgot to mention that its *cubic closest*

• AP Chem -

By the way, I made an error in the problem below. There are TWO atoms per unit cell for the body centered cubic structure; therefore, the mass of a single atom is TWICE 47.88*(1/6.022 x 10^23) etc. In cubic closest packing the volume occupied is about 74%.

• AP Chem -

I should have said the mass of the UNIT CELL is twice. Of course, the mass of a single atom is what was calculated previously. But you want the mass of a unit cell, not the mass of a single atom of Ti.

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