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Electric generating plants transport large amounts of hot water through metal pipes, and oxygen dissolved in the water can cause a major corrosion problem. Hydrazine (N₂H₄) added to the water avoids the problem by reacting with the oxygen:
N₂H₄(aq) + O₂(g) → N₂(g) +2H₂O(l)About 4X10⁷ kg of hydrazine is produced every year by reacting ammonia with sodium hypochlorite in the Raschig process:
2NH₃(aq) + NaOCl(aq) → N₂H₄(aq) + NaCl(aq) + H₂O(l) ΔH°rxn = -151kj
(a) If ΔH°rxn of NaOCl(aq) = -346 kJ/mol, find ΔH°rxn of N₂H₄(aq).

Respuesta :

An inorganic substance with the chemical formula N 2H 4 is hydrazine. It is a straightforward nictogen hydride, a flammable, colorless liquid with an ammonia-like odor.

If the hydrazine is entirely oxidized, nitrogen and water are created; if it is only partially oxidized, hydrogen and ammonia are formed. However, research has demonstrated that direct hydrazine fuel cells undergo a full 4e oxidation reaction (DHFCs). Once more, alkaline conditions prevent unwanted hydrolysis reactions. There is no product accumulation at the anode (BO2) that necessitates wasted fuel treatment, unlike with the fuel vectors including boron. The hydrazine/oxygen cell reaction's potential is once greater than the breadth of the prospective window of stability of water.  

   -151-(-346)=195 kJ

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