Hence, the rate equation for
this reaction will be
Rate = k [NO]
2[O2]
Rationalised 2023-24
68
Chemistry
The differential form of this rate expression is given as
[
]
[
] [
]
2
2
d R
O
NO
d
k
t
−
=
Now, we observe that for this reaction in the rate equation derived
from the experimental data, the exponents of the concentration terms
are the same as their stoichiometric coefficients in the balanced
chemical equation Some other examples are given below:
Reaction
Experimental rate expression
1 CHCl3 + Cl2 ®  CCl4 + HCl
Rate = k [CHCl3 ]  [Cl2]1/2
2 CH3COOC2H5 + H2O ®  CH3COOH + C2H5OH Rate = k [CH3COOC2H5]1 [H2O]0
In these reactions, the exponents of the concentration terms are not
the same as their stoichiometric coefficients