Chemistry help Calculate the rate of Ar gas, knowing that Xenon gas effuses at a rate of 48m/s. (Hint: both Ar and Xe are in group 18 of the periodic table)

Question

Calculate the rate of Ar gas, knowing that Xenon gas effuses at a

rate of 48m/s. (Hint: both Ar and Xe are in group 18 of the periodic table)

Answer 1

Graham's Law of Effusion:

rate gas 1/ rate gas 2 = sqrt MW gas2 / sqrt MW gas1 (rate is inversely related to molar mass)

rate Ar / rate Xe = sqrt 131 / sqrt 40

rate Ar / 48 = 1.81

rate Ar = 26.5 m/s = 27 m/s

(note: because Ar is lighter than Xe, we would expect it to effuse faster, and it does)