After 56.0 min, 25.0% of a compound has decomposed. What is the half-life of this reaction assuming first-order kinetics?

Answer 1

ln(No/N) = kt
Substitute No = 100
N = 75
t = 56
solve for k. The substitute k into
k = 0.693/t_l1/2
Solve for t_1/2

Answer 2

134.82