1. The problem statement, all variables and given/known data The decomposition of AB is first order with a k = 2.3 x 10-7 s-1 at 45oC. If the initial concentration is 0.25 M, the concentration after 2.3 min is: 2. Relevant equations ln[A]t = -kt x ln[A]0 3. The attempt at a solution I have subbed in the values I have but I am not getting the right answer. I am unable to solve the logarithmic equation and need help there but also need to know if my method is correct. I have subbed in: ln[A]t = -2.3 x 10-7 x 138 (seconds) x ln.25 I am getting : ln[A]t = 4.4 x 10-5 My problem is that I cannot remember how to solve that equation for [A]t. It's been a while since i looked at logarithmic equations. I have done google searches for the past hour and tried a few things but can't solve it. I'm not sure if my method is even correct in the first place. Please help.