Compare the rates of effusion of nh3 and o2

According the Graham's Law of effusion, if we let M₁ and R₁ be the mass and effusion rate of NH₃ and M₂ and R₂ be the mass and effusion rate of O₂, then:

R₂/R₁ = √ (M₁/M₂).

Since M₁ = 14.01 + 3*1.01 = 17.04 and M₂ = 16 * 2 = 32, we see that:

R₂/R₁ = √ (17.04/32) = 0.73

==> R₂ = 0.73 * R₁.

Thus, O₂ effuses at 73% the speed that NH₃ does