How many atoms of oxygen are in one formula unit of #Ca(NO_3)_2#?

1 Answer
Dec 2, 2017

Answer:

6.

Explanation:

#NO_3# has 3 atoms of oxygen in it per molecule (indicated by the subscript of 3) and #(NO_3)_2# means you have 2 #NO_3# molecules, meaning you double the subscript to get 6 oxygen atoms.

Following the same rules, there is 1 atom of nitrogen in 1 #NO_3# molecule (subscripts of 1 are not given) and 2 atoms of nitrogen in 2 #NO_3# molecules.