For the followinf set of balanced reactions,
`N_(2)O_(5)O_(2)rarr2NO_(2)+O_(3)" "DeltaH=200kJ`
`NO_(2)+O_(2)rarr2NO+O_(3)" "DeltaH=20kJ`
`10` moles of `N_(2)O_(5)` and 30 moles of `O_(2)` where taken in a chamber to cause complete conversion of `N_(2)O_(5)` to `NO_(2^.)NO_(2)` partially reacts with remaining oxygen such that volume percenfagr of `O_(3)` is `50%` Calculated overall enthaolpy change kJ.