Question

bromine and Air take about 15 minutes to diffuse completely but bromine diffuse into the vacuum very rapidly. why is this so

Answer 1

Bromine has a high density, I.e the molecules stays at the bottom if kept  In  a substance like metal block or any solid. No convection current takes place here as it has high density.

Due to coming in coming in contact with air, the molecules average speed decreases,  as more frequent collision takes place between the molecules and air. So speed decreases hence the diffusion Rate or speed of diffusion decreases.


But in vacuum,  there are no air particles,  molecules of bromine can diffuse much faster as there are no such frequent collisions within the atoms and the air compared to the molecules suspended in air. Hence molecules travel further increasing the diffusion Rate 
This is why bromine vapour  diffuse faster In Vacuum. 

Answer 2

Answer:

Because of the continuous motion of other gases in atmosphere, the diffusion of air and bromine particles takes 15 minutes. On the other hand, there is no gas present in vacuum which avoids obstruction of diffusion process and thus bromine diffuses in here very rapidly.

Explanation:

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