Calculate the enthalpy of reaction `(Delta H ^(@))`when ammonia is oxidized `:`
`4NH_(3) (g) + 5O_(2)(g) rarr 6H_(2)O(g) + 4NO(g)`
Standard enthalpies of formation `(Delta_(f) H^(@))` at `25^(@)C`for`NH_(3)(g),H_(2)O(g) ` and `NO(g)` are - 46.2, -241.8 and `+ 90.4 kJ //` mole respectively.