khickey304
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Use the data in the table above to calculate an approximate ΔH∘ in kilojoules for the synthesis of hydrazine from ammonia:
2NH3(g)+Cl2(g)⟶N2H4(g)+2HCl(g)

Respuesta :

MissPhiladelphia
On the left (reactant) side you have 6 N-H bonds and 1 Cl-Cl bond 
On the right (product) side you have 4 N-H bonds, 1 N-N bond and 2 H-Cl bonds 

Add up the bond energies for each side (multiplying by the number of bonds) and calculate the difference for your ΔHº

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