Answer to Question #56741 in Physical Chemistry for Shadi

Question #56741
Do Ideal Gases have mass or volume? I got asked this question and I got really confused... When I tried to find a solution and many different answers came up. Some say that ideal gases have negligible mass and therefore virtually no volume. Some say that ideal gases have no volume but do have mass. Thank you for reading
Expert's answer
The ideal gas has both volume and mass.
It can be concluded from the statement about the particles of the gas:
"Particles of the ideal gas are “point masses” (they have mass but zero volume)."
The ideal gas has a mass because its particles have a mass. Its mass is a sum of the masses of particles. Note, that zero volume refers only to particle which is negligible small compared to the average distance between particles. However, the volume of space, in which particles are dispersed, is comprised by both particles and space between them. Thus, it is significant. Volume of the ideal gas is present in all the calculations. For example, PV=nRT.

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