is much smaller than 
, A will be converted almost entirely
to B before much C is formed. Thus, we can ignore the rate law for A.
The rate law for B becomes
If is much smaller than , A will be converted almost entirely
to B before much C is formed. Thus, we can ignore the rate law for A.
The rate law for B becomes
with the approximate initial condition 
.
This equation can be solved by the method of separation of variables:
