Answer: In the given formula, 6 moles of oxygen atoms are present.
Step-by-step explanation:
We are given a chemical formula of calcium nitrate, which is
This compound is made up of calcium atoms, Nitrogen atoms and Oxygen atom.
In 1 mole of calcium nitrate, 1 mole of calcium atom, 2 moles of nitrogen atoms and 6 moles of oxygen atoms are present.
Thus, in the given formula, 6 moles of oxygen atoms are present.