Question about gases and kinetic theory

Badrakhandama
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i have a question that I cannot solve;

Show that the rms velocity of a sodium atom moving in a vacuum chamber at 300 kelvin is about 570 metres per second



pV=nRT and 3pV=Nm<c^2>
 
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You should use the formula http://en.wikipedia.org/wiki/Root_mean_square_speed" .
 
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