Helium-filled balloons rise in the air because the density of helium is less than the density of air.
(a) If air has an average molar mass of 29.0 g/mol, what is the density of air at 25°C and 770 mm Hg?
(b) What is the density of helium at the same temperature and pressure?
(c) Would a balloon filled with carbon dioxide at the same temperature and pressure rise?
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