Wk.10 #9

[Jaclyn Padilla]

The rate constant for this first‑order reaction is 0.430 s−1at 400 ∘C. A⟶products
How long, in seconds, would it take for the concentration of A
to decrease from 0.940 M
to 0.400 M?

How would I calculate this?

[joselle barnoya 1k]

Hello! Using the first-order equation you can solve for t ( the time it would take to decrease) by plugging in 0.940 for the initial concentration [A]0, 0.400 for the final concentration ([A]), and 0.43/s for k. From there it's very straightforward!

[Damin Rawlins 3B]

To calculate the time it would take for the concentration of A to decrease from 0.940 M to 0.400 M in a first-order reaction, use
t = ln([A]0/[A]) / k
where t is the time in seconds, [A]0 is the initial concentration of A, [A] is the concentration of A after a certain amount of time, and k is the rate constant of the reaction. Substitute the values given and solve for t! :)