The overall reaction order for this rate law is 4.
Explanation:
The order of the reaction is the sum of power of the concentrations of reactants.
The order of the reaction = a+b
According to reaction , the rate of the reaction is:
Rate = k[A]2[B][C]
Order of the reaction = 2 + 1 + 1= 4
The overall reaction order for this rate law is 4.