For the first order decomposition reaction:
`2N_(2)O_(5) (g) to 4NO_(2) (g) + O_(2) (g)`
Initially the total pressure is found to be 650 torr and after a very long time total pressure is found to be 1550 torr. If after 4 minutes from the start of the reaction partial pressure of `O_(2)= 100` torr , calculate half life of the decomposition in minutes. `["Given" : In 3= 1.1 "and" In 2= 0.7]`[Assume initially `O_(2)` is absent]

Answer

7