Equal amounts (1.00 mol) of helium and sulfur hexafluoride are each maintained at 298 K and 250 atm in identical rigid containers. Which gas’s observed volume exceeds its ideal-gas value by the greater percentage, and why?
(a) Helium, because its atoms experience weaker intermolecular attractions.
(b) Both gases deviate by the same percentage because only pressure—not molecular size—influences the deviation.
(c) Sulfur hexafluoride, because each molecule occupies more physical space.
(d) Helium, because its atoms have a smaller molar mass.