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

1 Answer
Evan Holbrook
Dec 2, 2017

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.

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