Question

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 (N2H) added to the water avoids the problem by reacting with the oxygen: N2H (aq) + O2(g) + N29) + 2 H2O(1) About 4 x 10' kg of hydrazine is produced every year by reacting ammonia with sodium hypochlorite in the Raschig process: 2 NH3(aq) + NaOCl(aq) + N2H4(aq) + NaCl(aq) + H2O(1) AH =-150 kJ (a) IF AH of NaoCl(aq) = -346 kJ/mol, find AH of NH(aq). 757 ® (b) What is the heat released when aqueous N2H, is added to 4.00 x 10L of plant water that is 2.50 x 10-MO,? Enter your answer in scientific notation. -757 78.0[2 heat released

Answer 1

2 H3 (@a) у GHz (aa) twaoculau) → Nethy Lao) twaldlaa) tholu дн° — -1517 a) Ahren= altf (m. Hy] + AHI (Nat] tahf[ex] + AHE[H₂o] - ДНЕСЈН-1 - ДНЕ (Aqsa —15 1 - ДНР (5, ня - 240.12 -167- 16 - 235-83-(2+-20-24) -(-316) ДНе С, Н, +36 LJ - b) No Hy to2 N2 + 2H2O ДНvд - ДНе (Нов - ДНе L, H, - 2 4 2 85-8) - 56 - - Go8 LI

moles 02= (4.0418) +(2.50X164) Moi E = -608 FS - 608 Kg TE=-6:08 410² kJ) heat released.