Given :
2NO2(g) + O2(g) → 2NO2(g)
Rate = k [NO2]2 [O2]
Order of the reaction with respect to NO = nNo = 2
Order with respect to O2 = \(n_{O_2}\) = 1
Overall order of the reaction = n = nNo + \(n_{O_2}\)
= 2 + 1
= 3
∴ Order with respect to NO = 2
Order with respect to O2 = 1
Overall order = 3
