24 and 25

D NO, + 24 Which statement or statements about the following reaction at 450 C is/are correct? 2502(g) + O2(g) 2503(g) 1 The reaction must involve a collision between one O2 and two SO2 molecules. Every collision between SO2 and O2 will produce SO3- III The rate-determining step is the slowest step of the reaction. I and III Ill only Il only None of the statements is correct 25 If the mechanism of a reaction is: AB + AB AB slow AB4 A + 2B2 fast (a) What is the overall equation the reaction? (b) What is the rate expression for this reaction? (c) What units will the rate constant have in this expression? B