When two NO2 molecules collide and react, they can form a bond or exchange an oxygen atom. For the oxygen exchange, Ea = 33.9 kJ/mol, and the rate constant at 250oC is 8.6 x 102 M-1s-1. Estimate the rate constant for oxygen exchange at room temperature 25oC. (Note: Do not include units, present your answer to 2 significant figures)