So, a further
change in reaction conditions is unable to alter the amount of ammonia
on the surface of the catalyst making rate of the reaction independent
of its concentration 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