Question

The initial concentration of C2H6N2 in the first-order reaction C2H6N2→N2+C2H6 is 0.427 M. After 30. seconds, the concentration of C2H6N2 is 0.395 M. What is the rate constant k for the reaction?

Answer 1

2.6×10^-3 mols-1

Step-by-step explanation:

From

k= 2.303/t × log[A]o/[A]t

Time taken t= 30 seconds

Initial concentration [A]o= 0.427M

Concentration at time (t) [A]t= 0.395M

k= 2.303/30 ×log[0.427]/[0.395]=2.6×10^-3 mols-1