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# How many atoms of oxygen are found in aluminum nitrate?

How many atoms of oxygen in one formula unit of ##Al(NO_3)_3##? 9 atoms precisely.

In 1 formula unit of ##Al(NO_3)_3##, there are (clearly!) 9 atoms of oxygen, 3 nitrogen atoms, and 1 aluminum atom. I have gone on before that (##N_A##, Avogadro's number) is simply a much larger number, i.e. ##N_A## ##=## ##6.022xx10^23##.

So, in 1 mole of ##Al(NO_3)_3## there are ##(9## ##xx## ##N_A)## ##O## atoms precisely. What is the mass of 1 mol ##Al(NO_3)_3##?