Posted by Nick on .
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 
Nick,
sorry, forgot to mention that its *cubic closest*

AP Chem 
DrBob222,
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 
DrBob222,
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.