The reaction `2N_(2)O_(5)(g)rarr4NO_(2)(g)+O_(2)(g)` follows first order kinetics. The pressure of a vessel containing only `N_(2)O_(5)` was found to increase from 50 mm Hg to `87.5` mm Hg in 30 mim. The pressure exerted by the gases after 60 min. will be (Assume temperature remains constant):
A. `106.25` mm Hg
B. `116.25` mm Hg
C. 125 mm Hg
D. `150 mm Hg
