A first order reaction ABC → AB + C has a rate constant of 0.0125 /s. If the initial concentration of ABC is 0.500 M, what is the concentration of ABC after 5 minutes? Note: do not include units in your answer, do not use scientific notation.

Answer 1

ln(Ao/A) = kt
If you use k as listed than t is 5 min x (60 s/min) = 300 s.
Solve for A

Answer 2

0.012