Question : what is the formula for chromium (III) Nitrate?
Answer : chromium (III) nitrate is Cr(NO3)3 (there is one chromium atom that has a charge of 3+, so there needs to be three nitrate anions with a charge of 1- to make a net charge of 0).
How : Chromium nitrate is made up of a lot of multiple inorganic compounds. Mostly Oxygen and Nitrogen.
-procklown