Solved: Electric generating plants transport large amounts of hot water through metal
Chapter 6, Problem 6.109(choose chapter or problem)
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: About 4 107 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) _H_rxn _ _151 kJ (a) If _H_f of NaOCl(aq) __346 kJ/mol, find _H_f of N2H4(aq). (b) What is the heat released when aqueous N2H4 is added to 5.00 103 L of plant water that is 2.50 10_4 M O2?
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