Hence, reactions with the
molecularity three are very rare and slow to proceed It is, therefore, evident that complex reactions involving more than
three molecules in the stoichiometric equation must take place in more
than one step KClO3 + 6FeSO4 + 3H2SO4 ® KCl + 3Fe2(SO4)3 + 3H2O
This reaction which apparently seems to be of tenth order is actually
a second order reaction This shows that this reaction takes place in
several steps