Which of the following statements are applicable to a balanced chemical equation of an elementary reaction?
For an elementary reaction (Reaction in which one or reactants react in a single step to for a product) the molecularity and the order is the same for example
A + B
Products (single-step elementary reaction)
R=k[A][B]
Order = 1+1=2
Molecularity is 2, therefore, molecularity and order are the same.
Molecularity is the number of the reacting species (atoms or molecules) that must collide in order to give a stable product.
Hence the molecularity of a reaction can never be zero or non-integer for a complete reaction.
1