The thermal decomposition of HI on gold surface
is another example of zero order reaction In this class of reactions, the rate of the reaction is proportional to the
first power of the concentration of the reactant R For example,
R ® P
[
]
[
]
d R
Rate
R
d
k
t
= −
=
or  
[ ]
[ ]
d R
– d
R
k t
=
Integrating this equation, we get
ln [R] = – kt + I
(3 8)
Again, I  is the constant of integration and its value can be determined
easily