The decomposition of `N_(2)O_(5)` in chloroform was followed by measuring the volume of `O_(2)` gas evolved :
`2N_(2)O_(5)(C C_(4))to2N_(2)O_(4)(C Cl_(4))+O_(2)(g)`. The maximum volume of `O_(2)` gas obtained was `100cm^(3)`. In 500 minutes, `90cm^(3)` of `O_(2)` were evolved. The first order rate constant (in `min^(-1))` for the rate of disappearance of `N_(2)O_(5)` is
A. `(2.303)/(500)`
B. `(2.303)/(500)"log"(100)/(90)`
C. `(2.303)/(500)"log"(90)/(100)`
D. `(100)/(10xx500)`
