- #1

Attraction

- 28

- 0

## Homework Statement

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:

## Homework Equations

ln[A]

_{t}= -kt x ln[A]

_{0}

## 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.