Question about gases and kinetic theory

[Badrakhandama]

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>

 

[rock.freak667]

You should use the formula http://en.wikipedia.org/wiki/Root_mean_square_speed" .