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Chemical Energy

Hydrazine, a ...

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Hydrazine, a component of rocket fuel, undergoes combustion to yield N_{2 }and H_2O . N_2H_4 +O_2 → N_2 + 2 H_2O What is the enthalpy combution of N_2H_4 (kJ/mole) Given Reaction △ H/kJ 2NH_3 + 3N_2O→4N_2 + 3H_2O -1011kJ N_2O + 3H_2→ N_2H_4 + H_2O -317kJ 4NH_3 + O_2→2N_2H_4 + 2H_2O -286 kJ H_2 + 1/2 O_2→ H_2O -285 kJ (a) -620.5 (b)-622.75 (c) -1167.5 (d) 622.7

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N_{2}

N_{2} H_{4} + O H^{-} \to N_{2} + H_{2} O + e^{-}

N_{2} H_{4}

H_{2} O

H_{2} O_{2}

2 H_{2} O_{2} \to 2 H_{2} O + O_{2}

H_{2} O

- 188

H_{2} O_{2}

- 286

2 H_{2} O_{2} \to 2 H_{2} O + O_{2}

N_{2} + 3 H_{2} ⇌ 2 {N H}_{3}

K_{1}

N_{2} + O_{2} ⇌ 2 N O

K_{2}

H_{2} + \frac{1}{2} O_{2} ⇌ H_{2} O

K_{3}

2 {N H}_{3} + \frac{5}{2} O_{2} ⇌ 2 N O + 3 H_{2} O

K_{1}, K_{2}

K_{3}

N_{2} + 3 H_{2} \to 2 N H_{3} - K_{1}

N_{2} + O_{2} \to 2 N O - K_{2}

H_{2} + 1 / 2 O_{2} \to H_{2} O - K_{3}

3 H_{2} + 5 / 2 O_{2} \to 2 N O + 3 H_{2} O

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