A second order reaction is 50 % complete in 16 minutes. How long will it take to be 82 % complete

Answer 1

(1/A) - (1/Ao) = kt
Determine k. A = 50. Ao = 100. t = 16 min.

Then use the same equation but A = 18(that's 100-82); Ao = 100; k from above. Solve for t in minutes.