Posted by Chelsea on .
where R=8.314 J/(mol·K) and ℳ is molar mass in kilograms per mole. Note that a joule is the same as a kg·m2/s2.
What is the rms speed of N2 molecules at 335 K?
What is the rms speed of He atoms at 335 K?

Chemistry #26 
DrBob222,
rms = sqrt (3RT/M)