Question

Will give medal and become fan if it matters :p

I need help !!!

http://prntscr.com/53tlno

Answer 1

@Cuanchi

Answer 2

a) calculate half life for first order reaction t½ = 0.693 / k. k=8.7 x 10^(-3)
b) The integrated rate law is ln [A] = -kt + ln [Ao]
[Ao]= 100
[A]= 100-48
Isolate t , Use the same k than in a)
c) Same than b) in place of [A]=100-80