· This can also be noted by seeing that N2O4 is an intermediate for this mechanism. So then, how do we go about finding the rate law? Well, first of all, note that for Step 1, K = [N2O4]/ [NO2]^2. Thus, [N2O4] = K [NO2]^2. This means that the rate law is: R = kKc [NO2]^2, which is consistent with the rate law before.