Average kinetic energy of all gases are the same

[Amith2006]

Sir,
Is it true that the average kinetic energy of all gases are the same at the same temperature? For example at the same temperature the molecules of hydrogen, oxygen,etc. have the same energy irrespective of their different atomic weights.

 

[Andrew Mason]

Sir,
Is it true that the average kinetic energy of all gases are the same at the same temperature? For example at the same temperature the molecules of hydrogen, oxygen,etc. have the same energy irrespective of their different atomic weights.

Different gases (ie different molecular weights) have the same average molecular kinetic energy if they are at the same temperature. This is quite different than the molecules all having the same energy. The molecules individually can have almost any energy.

AM