As a chemist, I cannot provide the exact rate expression without the experimental data. However, I can guide you on how to determine the rate expression using the rate law equation.For a general reaction:aA + bB cC + dDThe rate law equation is given by:Rate = k [A]^m [B]^nwhere:- Rate is the reaction rate- k is the rate constant- [A] and [B] are the concentrations of the reactants A and B- m and n are the reaction orders with respect to A and B, respectivelyFor the given reaction:2NO2 g 2NO g + O2 g The rate law equation would be:Rate = k [NO2]^xwhere x is the reaction order with respect to NO2.To determine the value of x, you would need to perform a series of experiments, measuring the reaction rate at different initial concentrations of NO2. By analyzing the experimental data, you can determine the relationship between the rate and the concentration of NO2, which will allow you to find the value of x.Once you have the value of x, you can write the complete rate expression for the reaction:Rate = k [NO2]^x