Question

At the beginning of an experiment, the concentration of nitrogen dioxide in a reaction vessel was 0.1103 mol/L. After 65.0 s, the concentration decreased to 0.1076 mol/L. What is the average rate of decomposition of NO2 during this time interval, in mol/(L ∙ s)?

Answer 1

-4.15*
`10^(-5)mol/(L.s)`

Step-by-step explanation:

Average rate =
`(final concentration -initial concentration)/(change in time) = (0.1076mol/L-0.1103mol/L)/(65s)=-4.15.10^(-5)mol/(L.s)`

The rate is negative because it is a decomposition and our focus is the reactant which is depleting.