Question

A zero-order reaction has a constant rate of 4.40×10−4 m/s. if after 45.0 seconds the concentration has dropped to 1.50×10−2 m, what was the initial concentration? express your answer with the appropriate units.

Answer 1

The  zero  order  means  that  the  rate  does  not  depend  on  concentration.   Therefore  the  rate  is  constant  even if  the  concentration  changes.For   each  second  it  goes  by   4.40  x  10^-4  is  consumed

what  about  45  second
=45 s x  (4.4  x10^-4m/s)=0.0198m
The  total  initial  is  therefore=  0.0198+(1.50  x10^-2)= 0.0348m