The half-life of the following first order reaction is 231 seconds. What percent of the original concentration of nitrite ion remains after 10.0 minutes?

Question

NH4+ + NO2- --> N2 + 2H2O

Answer 1

how many half lives?
10 * 60 = 600
600/231 = 2.6
(1/2)^2.6 = .165
.165*100 = 16.5 %