OK it is time to calculate the density of a solid from the unit cell.
TNT is an orthorhombic solid with a cell which is 6.077 by 14.991 by 20.017 Å. You will be glad to know that all the angles are 90 degrees (be thankful for small mercies !).
Here is a picture of the unit cell where I have completed all the bits which stick out of the unit cell. I have used a space-filling plot and it is of no use to you as it is jam packed with bits which stick out all over.
How here is a picture of the unit cell with only the atoms inside the cell. It is a bit more easy now but with the space-filling plot but I do not think you have a hope !
Now I will be kind and switch to a ball and stick view.
You can count the atoms if you want to, as I am in reality a kind person I have listed the numbers of atoms. You have 176 atoms in total inside the cell.
You have 64 carbons, 40 hydrogens, 24 nitrogens and 48 oxygen atoms.
Now you need to calculate the density of the solid. I hope you have a real blast of a good time doing the calculation !
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