Question

If o2 comes from the sun to earth, it takes 40 seconds for air, then how long will it take for He​

Answer 1

Explanation:

The molar mass of O2 is 16 g/mol while the molar mass of He is 4 g/mol. Now the rate of diffusion depends on the molar mass also. A gas which is heavier or has more molar mass, its diffusion rate will be lower than the gas which has lower molar mass.

Now since the ratio of molar mass of He to Oxygen is 1:4, so He would diffuse 4 times faster, hence would reach in 10 sec