Chemistry
marciekayla
2020-11-21 16:48:27
Use the data in the table above to calculate an approximate ΔH∘ in kilojoules for the synthesis of hydrazine from ammonia: 2NH3(g)+H2O2(g)⟶N2H4(g)+2H2O(g)
ANSWERS
kittu7840
2020-11-21 22:22:55

deltaH formation = deltaH of broken bonds - deltaH of formed bonds Broken bonds: tiple bond N-N and H-H bond Formed bonds: N-H and N-N bonds You also have to take note of the molar coefficients deltaH formation =  [(N≡N) + 2 * (H-H)] - [4 * (N-H) + (N-N)]                             = (945 + 2*436) - (4*390 + 240)                             = 17 kJ/mol The answer is 17 kJ/mol.

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