Container A contains 1.00 mole of Xe gas and Container B contains 1.00 mole of He gas. Both gases are at 100.0 °C. How much faster will the He diffuse than Xe?

Answer 1

The atomic mass of He is 4.00 g / mole

The atomic moss of Xe is 131 g / mole

Since He is lighter, it will diffuse faster. How much faster? This is determined by Grahams's Law of Effusion (diffusion) which states that under identical conditions, the effusion/diffusion of a gas is inversely related to the square of it molar mass. Thus..

rate He / rate Xe = √131 / √4

rate He / rate Xe = 11.44 / 2.00 = 5.7

So, He will diffuse 5.7 x faster than Xe