The Noble Gases,listed by Increasing Molecular Weight,are He,Ne,Ar,Kr,Xe,and Rn

The noble gases,listed by increasing molecular weight,are He,Ne,Ar,Kr,Xe,and Rn.If samples of 1 mole each of these gases are placed in separate containers and heated to 300 K,which gas has the greatest internal energy and the molecules of which gas have the highest rms speed?

A) The He has the greatest internal energy,and the Rn has the greatest rms speed.
B) The Rn has the greatest internal energy,and the He has the greatest rms speed.
C) All the gases have the same internal energy,and the Rn has the greatest rms speed.
D) All the gases have the same internal energy,and the He has the greatest rms speed.

Correct Answer:

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