Each formula unit of HNO3 contains 3 oxygen atoms. The ratio of oxygen atoms to formula units is 3/1.
then 3.0 moles of HNO3 X 3/1 = 9 moles of oxygen atoms.
A mole is 6.02 X 10^23 units, so the answer is 9 X 6.02 X 10^ 23
or about 5.4 X 10^ 24
What is oxygen?
Oxygen is a chemical element – a substance that contains only one type of atom. Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus. Oxygen is a gas at room temperature and has no color, smell, or taste.
to learn more about oxygen atoms: https://brainly.com/question/15457775
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