The difference
between elementary and nonelementary reaction as follows
Elementary reaction
- A reaction in which the molecules
react exactly as per its stoichiometric equation is called an elementary
reaction.
- Hence for this elementary
reaction, in rate equation, the order with respect to particular reactant
is equal to its stoichiometric coefficient of that reactant in the
stoichiometric equation.
- An elementary reaction is a single
step reaction
- For irreversible elementary
reaction
a A + b B → r R
- the rate equation is
Nonelementary reaction
- A reaction in which the formation
of product from the original reactants occurs through a series of steps is
called as a nonelementary reaction
- The individual reaction steps
which involve in the overall reaction are termed as the elementary
reaction
- In nonelementary reaction, the
order with respect to particular reactant is not identical with the
stoichiometric coefficient of that reactant in the stoichiometric
equation.
- For nonelementary reaction
a A + b B → r R
- the rate equation is
- where ∝ and β are the orders with respect to
reactants A and B and are found by experimental observations
- where ∝ ≠ a and β ≠ b
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