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Electric generating plants transport large amounts of 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) + 2 H2O(l) About 4x10^7 kg of hydrazine is produced every year by reacting ammonia with sodium hypochlorite in the Raschig process: 2 NH3(aq) + NaOCl(aq) → N2H4(aq) + H2O(l) Δh degrees =-151 kJ a) If ΔHf of NaOCl(aq) =-346 kJ/mol, find ΔHf of N2H4(aq).