The rate constant for this first‑order reaction is 0.740 s − 1 0.740 s−1 at 400 ∘ c. 400 ∘c. a ⟶ products a⟶products how long, in seconds, would it take for the concentration of a a to decrease from 0.790 m 0.790 m to 0.230 m? 0.230 m?

1.668 S

Step-by-step explanation:

We are given that

Product

For first order reaction,

Rate constant=k=

Temperature=

We have to find the time taken by the reaction when concentration of A to decrease from 0.790 M to 0.230 M.

Substitute the values then we get

Hence, it would take 1.668 s for the concentration of  A to decrease from 0.790 M to 0.230 M.

option: d is correct

step-by-step explanation:

my answer is$ 12

step-by-step explanation:

because 15 -2=12