Final answer:
All gas samples listed—1 mole of oxygen, nitrogen, hydrogen, and carbon dioxide—have the same volume of 22.4 L at STP, according to Avogadro's hypothesis.
Step-by-step explanation:
The question asks which gas sample has the greatest volume at STP, choosing from 1 mole of oxygen, 1 mole of nitrogen, 1 mole of hydrogen, and 1 mole of carbon dioxide. According to Avogadro's hypothesis at STP, one mole of any gas occupies a volume of 22.4 L. Thus, it follows that all the given gases in the question will have the same volume at STP when comparing equal moles, specifically 1 mole will occupy 22.4 L regardless of the gas in question.