Answer:
-4.15*[tex]10^{-5}mol/(L.s)[/tex]
Explanation:
Average rate = [tex]\frac{final concentration -initial concentration}{change in time} = \frac{0.1076mol/L-0.1103mol/L}{65s}=-4.15.10^{-5}mol/(L.s)[/tex]
The rate is negative because it is a decomposition and our focus is the reactant which is depleting.