A cylinder contains a mixture of helium and argon gas in equilibrium at 1500C. what is the rms speed of each type of molecule?

Rms speed of ideal gas molecule is given by  Vrms=3kTm=3×1.38×10-38×(273+150)4×1.67×10-27 m/s =1.62 km/sWe find root-mean square velocity for helium, vrms = 1.62 km/s