Question

why does air diffuses faster than oxygen

Answer 1

lighter gases diffuse faster than heavier ones .As air is lighter than oxygen so air diffuses faster.

Answer 2

Diffusion is faster in air than in water. This is because air is less dense than water. A diffusing chemical in air would run into fewer molecules as it spreads out. On the other hand, a diffusing chemical in water would have to push through all the water molecules to spread out, which would slow its diffusion down.