Question

Different gases have different mass but they occupy same volume.why?​

Answer 1

Air has 78% nitrogen, 21% oxygen and 1% other gases means all gases are mixed in unequal amounts then it should be a heterogeneous mixture...

Answer 2

Answer:

Mass Density of a Gas

This is the mass of the gas relative to the volume of the gas. Because gases that are behaving ideally under the same conditions (temperature, pressure) all have the same number density, they will all have different mass densities since different gases have different masses per particle.