How many atoms of oxygen are found in aluminum nitrate?

1 Answer
anor277
Nov 6, 2015

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

Explanation:

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 the mole (#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#?

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