The rms speed of oxygen molecules is 460 m/s at 0°C. The atomic weight of an oxygen atom is approximately 4 times the atomic weight of a helium atom. However, the helium molecule is monatomic whereas the oxygen molecule is diatomic. The rms speed of helium at 40°C is approximately O 1.84 km/s O 880 m/s O 3.68 km/s O 440 m/s O 1.08 km/s

The rms speed of oxygen molecules is 460 m/s at 0°C. The atomic weight of an oxygen atom is approximately 4 times the atomic weight of a helium atom. However, the helium molecule is monatomic whereas the oxygen molecule is diatomic. The rms speed of helium at 40°C is approximately O 1.84 km/s O 880 m/s O 3.68 km/s O 440 m/s O 1.08 km/s