Why isn't a molecule's kinectic energy dependant on mass?

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Discussion Overview

The discussion revolves around the relationship between a molecule's kinetic energy, mass, and temperature, specifically questioning why average translational kinetic energy is said to depend only on temperature and not on mass. Participants explore the implications of mass on molecular motion and energy distribution in gases.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions the assertion that a molecule's average translational kinetic energy depends only on temperature, suggesting that heavier molecules would have more inertia and travel slower with the same energy.
  • Another participant agrees with the idea that heavier atoms would have less kinetic energy if the same amount of heat is supplied to different gases, implying a relationship between mass and kinetic energy.
  • A different participant challenges the notion that one gas could end up with more energy than another if heat is considered energy, raising questions about energy distribution among gases of different masses.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between mass, kinetic energy, and temperature, indicating that multiple competing perspectives remain without a consensus.

Contextual Notes

Participants do not fully explore the assumptions behind the definitions of kinetic energy and temperature, nor do they clarify the conditions under which their claims hold true.

aracali
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So my book say's
"A molecule's average translational kinetic energy depends only on the temperature, not on the molecule's mass. If two gases have the same temperature, their molecules have the same average translational kinetic energy."​
My question is, why?
I mean, wouldn't molecules with bigger mass have more inertia and therefore would travel slower with the same amount of energy (which is related to temperature)?
 
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aracali said:
I mean, wouldn't molecules with bigger mass have more inertia and therefore would travel slower with the same amount of energy (which is related to temperature)?
Yes.
 
A.T. said:
Yes.
Also from my point view if we consider two different gases and we supply same amount of heat to both of them the one gas whose atoms are more heavier will have less kinetic energy and one which is lighter than the other one will have more kinetic energy
 
If heat is energy why would one gas end up with more than the other
 

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