If 4.83 mL of an unknown gas effuses through a hole in a plate in the same time it takes 9.23 mL of argon, Ar, to effuse through the same hole under the same conditions, what is the molecular weight of the unknown gas?

Answer 1

(rate 1/rate 2) = sqrt(M2/M1)
rate = 4.83/sec and 9.23/sec.