Question

Can the molecularity of a complex reaction be derived from the stoichiometry of the reaction?

Answer 1

No, the molecularity of a complex reaction cannot be derived from the stoichiometry of the reaction because molecularity is defined only for an elementary reaction, which occurs in a single step and involves a definite number of molecules or species colliding simultaneously, whereas a complex reaction proceeds through multiple elementary steps and its overall stoichiometric equation merely represents the net chemical change without revealing the actual mechanism or the number of species involved in each step; therefore, the molecularity of the reaction cannot be determined from the stoichiometry alone.