Can somebody help me with this?

Determine the ?H for the formation of hydrazine, N2H4 from N2 and 2H2 according to this eqn:?
N2(g) + 2H2(g) --> N2H4

Bond Energies:
N--N 159 kJ/mol
N=N 201 kJ/mol
N=N 941 kJ/mol
H--H 436 kJ/mol
H--N 389 kJ/mol

9/1/2009 7:07:21 PM

you're breaking the bonds of N2 and the bonds of 2 mols of H2. nitrogen has zero charge with three bonds, and hydrogen just one. d_H will then just be the bond energies of products minus reactants

9/1/2009 10:11:17 PM