Molecularity of reaction
- Molecularity is the number of
atoms, ions or molecules that must collide with one another
simultaneously so as to result in a chemical reaction.
- It is a theoretical quantity and
can be calculated by adding the molecules of the slowest or rate
determined step.
- It is always a whole number and
never be zero or fraction.
- For simple reactions, the
molecularity can usually be obtained from the Stoichiometry of
the equation.
Order of reaction
- Order of reaction is the sum
of the exponents/powers of the concentrations in the rate
law equation.
- It is the experimental quantity
and can not be calculated theoretically.
- It need not be a whole number
i.e. it can be fractional as well as zero.
- Even the order of a simple
reaction may not be equal to the number of molecules of the reactants
as seen from the unbalanced equation.
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