Omposition of planetary atmospheres

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The composition of planetary atmospheres is determined in part by the speeds of the molecules of the constituent gases, because the faster moving molecules can reach escape velocity and leave the planet. What is the R.M.S speed in ms^-1 of the helium species at 325K?
 
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Can you write the equation for RMS velocity given the molecular mass of the atom/molecule and temperature?

If not, then read - http://www.chem.arizona.edu/~salzmanr/480a/480ants/kmtmod/kmtmod.html
 

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