Question

A flask contains a mixture of compounds a and

b. both compounds decompose by first-order kinetics. the half-lives are 54.0 min for a and 18.0 min. for

b. if the concentartions of a and b are equal initially, how long will it take for the concentration of a to be four times that of b

Answer 1

a and b r equal
time of b is 18.0min
4×18=72
72.0min