What is the statement of rate law?
Rate law is the expression in which reaction rate is given in terms of molar concentration of ractants with each term raised to some power, which may or may not be same as stoichiometric coefficient of the reacting species in a balanced chemical equation.
For example: 2NO + O2 --- 2NO2
hence the rate law = k [NO]2 [O2]
here k is rate constant