Hi everyone!

I'm having trouble with this one:

**At 55 degrees Celsius, a substance degrades by 75,2% in 10 minutes. This is a first-order reaction. What is the reaction rate constant (k)?**

I tried to solve this using (1) k=1/t x ln(c_{0}/c_{t}), where t - time, c_{0}=original concentration, c_{t}=final concentration=(100-75,2)% of c_{0} and got k=2,32 x 10^{-3}

As I understand from my physical chemistry conspectus, formula (1) does apply for first-order reactions but I'm uncertain about not including the temperature.

Do I have to use the Arrhenius equation to find the solution, or is there a simpler way?

Thanks in advance for any hints at all!