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Depends on the temperature (higher is faster). Velocities are distributed according to Boltzman distribution, but on average the kinetic energy is kT (boltzman constant times temperature). With classical kinetic energy according to m*v*v/2, the velocity would be

v = sqrt(k*T*2/m)

Filling in the mass of molecular oxygen and room temperature (~300 K) gives almost 400 m/s (880 mph or 1440 km/h). It's an average and some approximation, but should give a rather good idea of order of magnitude.

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