Web Analytics
vizslaboxerAGR
Answered

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)

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) class=

Verified Answer :

MissPhiladelphia

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 + 2436) - (4390 + 240)
                            = 17 kJ/mol

The answer is 17 kJ/mol.

Related Questions