Which gas occupies the highest volume at STP?

At the same temperature and pressure, equal numbers of moles of any gas occupy equal volumes, so volume is proportional to the number of moles. The choices contain 0.02 mol of CO₂, 1 mol of N₂, 2 mol of H₂, and 0.1 mol of Cl₂. Since 2 mol is the greatest amount, 2 mol of H₂ occupies the highest volume.

AI-written and checked against the verified answer.