Question on Molecules of a gas at constant temperture -Gen Chem Dat Destroyer

[Mrhyde]

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Hi I have a slight confusion...

On Dat destroyer Number 44 explanations : it states "Since the Temp. is the same the molecules all have the same average kinetic energy"

... So then I wrote in my notes : "All Gases will have the same Average Kinetic Energy if they are at the same Temperature"

But then number 68 in the explanations states : "At a given temperature molecules of a gas move at different speeds"

So now I am confused ?????? As this is conflicting each other

 

[deleted738762]

I haven't read the question, but based on what I know:

Same temperature= same average kinetic energy. However, they might have different velocities.

If you compared cologne (C2H5OH) and sweat (CH4?) and ask which one reaches your nose faster at room temp. Well they move the same via kinetic energy, but lighter gas moves at faster average velocity. CH4 is the lighter gas and has the higher velocity, but still the same kinetic energy.

Graham's law of effusion discusses this concept.

 

[Mrhyde]

Thank you that makes sense to me