Question

the constant rate is 0.28s^-1 at 400C how long, in seconds for a concentration to decrease from 0.770 M to 0.330M using first order

Answer 1

It would take approximately 1.045 seconds for the concentration to decrease from 0.770 M to 0.330 M using first order.

Step-by-step explanation:

The question asks how long it will take for the concentration to decrease from 0.770 M to 0.330 M using first order. To solve this, we need to use the integrated rate law for first-order reactions, which is:

[A]t = [A]0e^(-kt)

We can rearrange this equation to solve for time:

t = ln([A]t/[A]0) / -k

Plugging in the values, we have:

t = ln(0.330 M / 0.770 M) / -0.28 s^-1

t = ln(0.4286) / -0.28 = 1.045 s

Therefore, it would take approximately 1.045 seconds for the concentration to decrease from 0.770 M to 0.330 M using first order.