Module 4: Chemistry of combustion
  Lecture 20: Order reaction
 


First order reaction,

Consider the first order reaction,
 

Reaction rate,

 

Sepataring the variables and integrating,

 
(Figure 20.1)
 
First order combustion reactions!
 
Note :

concentration decreases exponentially with time (Refer Fig),
All unimolecular reactions obey first order kinetics!
All first order reactions need not to be unimolecular!!