8. Rank the bonds in order of increasing bond length and increasing bond strength:
CEN, CEO, C=C
S-N, S-S, S-H
9. Find $\Delta H_{rxn}$ for the following reaction:
$N_2 + 3H_2 \rightarrow 2NH_3$
Use the bond energies from list below:
N-H: 391 kJ/mol
H-H: 436 kJ/mol
N-N: 160 kJ/mol
N=N: 418 kJ/mol
N$\equiv$N: 941 kJ/mol
Answer: -97 kJ