The average kinetic energy of the molecules in a gas sample depends only on the temperature, T. However, given the same kinetic energies, a lighter molecule will move faster than a heavier molecule, as shown in the equation for rms speed rmsspeed=M3RT where R=8.314J/(molK) and is molar mass in kilograms per mole. Note that a joule is the same as a kilogram-meter squared per second squared (kgm2/s2). What is the rms speed of N2 molecules at 279K ? rins speed What is the rms speed of He atoms at 279K ? What is the rms speed of He atoms at 279K ? rms speed