[A] starts at 1.00 M. At t = 100 s, [A] = 0.50 M. At t = 200 s, [A] = 0.25 M. At t = 300 s, [A] = 0.125 M.
What is the order of the reaction?
- A
Third order
- B
Zero order
- Ccheck_circle
First order
- D
Second order
Explanation
Constant half-life (100 s) regardless of starting concentration is the signature of first-order kinetics.