Which diffuse faster heavy particles or light particles?

Answer 1

In general lighter particles should diffuse faster than heavier particles, this could be extrapolated from the relationship to mass, volume, and energy. If we look at particles of all the same, ideal, substance, we would see that an object with less mass would be smaller but would also require less energy to move. That is, at the same temperature a particle of lower mass would move faster than a similar particle of heavier mass. We also see that smaller particles also maximize surface area/mass - this is also conducive to faster diffusion.

Answer 2

Light particles diffuse faster than heavy particles due to their higher speed and kinetic energy, which allows them to move more quickly through a medium. Heavy particles have a slower diffusion rate because of their larger mass and lower speed.