Why do different gases have different densities?

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Discussion Overview

The discussion revolves around the question of why different gases exhibit different densities. Participants explore the relationship between mass, volume, and gas identity, considering concepts such as the ideal gas law and the properties of gas molecules.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant notes that gas molecules do not have attractions or regulations between them, prompting the question of density differences.
  • Another participant inquires whether the masses of the gases in question are identical.
  • A third participant explains that density is defined as mass over volume, suggesting that differences in density must arise from variations in mass, volume, or both.
  • A later reply introduces the concept of the ideal gas and questions how its volume relates to the number of moles, specifically under certain pressure and temperature conditions.
  • This participant also asks whether the volume of a gas, when described by the ideal gas approximation, depends on the identity of the gas.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as participants raise different aspects of the relationship between gas properties without resolving the initial question of density differences.

Contextual Notes

Participants do not clarify assumptions regarding the ideal gas law or the specific conditions under which gases are being compared, leaving some aspects of the discussion unresolved.

Qaawar
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I've read that gas molecules do not have any attractions or regulations between them...
So why do different gases have different densities?
 
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Are their masses identical?
 
Density is mass over volume. So for a gas to have different densities, either the volume or the mass (or both) have to be different. This also means that either the volume or the mass can be the same.

The claim you mention in your post, does that reflect on the mass part of the volume part?
 
Do you know what ideal gas is? And how its volume is related to the number of moles?

For a given number of moles and given p, T conditions, does the volume of the gas (as long as it is well described by the ideal gas approximation) depend on the gas identity?
 

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