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Calculate enthalpy of the reaction : 4NH...

Calculate enthalpy of the reaction : `4NH_3(g) +3O_2(g) rarr 2N_2(g)+ 6H_2O (I)` at 298K, given `/_\H_f` for , ` NH_3 (g)`, `H_2O (I)` are - 46 k J / mol and -286 k J per mol respectively.

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