Air has a density of 0.001293 g/cm³. which of these gases would make a balloon float in air? check all that apply. nitrogen, density: 0.001251 g/cm³ carbon monoxide, density: 0.001977 g/cm³ helium, density: 0.000178 g/cm³ carbon dioxide, density: 0.001977 g/cm³ hydrogen, density: 0.00009 g/cm³ oxygen, density: 0.001429 g/cm³