Concentrations measured as a function of time when gaseous `N_(2)O_(5)` at initial concentration of `0.0200 M` decomposes ot gaseous `NO_(2)"and"O_(2) "at" 50^(@)C.`The change in concentration with time is given by the following graph.
The rate of decomposition of `N_(2)O_(5)`during the period 300-400 s is :
A. `4xx10^(-4) M//s`
B. `3xx10^(-5)M//s`
C. `2xx10^(-5)M//s`
D. `4xx10^(-8)M//s`