( )
( )
( )
1130K
3
2
2
Pt catalyst
2NH
g
N
g +3H
g
→
Rate = k [NH3]0 = k
In this reaction, platinum metal acts as a catalyst At high pressure,
the metal surface gets saturated with gas molecules 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