Hydrazine (N2H4\text{N}_2\text{H}_4N2H4) is a highly reactive liquid used as a rocket propellant. Its combustion with oxygen is represented by the following chemical equation:
N2H4+O2→N2+2H2O\text{N}_2\text{H}_4 + \text{O}_2 \rightarrow \text{N}_2 + 2\text{H}_2\text{O}N2H4+O2→N2+2H2O
The displayed formulae for this reaction are shown below:
Look at the table showing some bond energies:
| Bond | Bond energy (kJ/mol) |
|---|---|
| N-H\text{N-H}N-H | 391 |
| N-N\text{N-N}N-N | 160 |
| O=O\text{O=O}O=O | 498 |
| N≡N\text{N}\equiv\text{N}N≡N | 945 |
| O-H\text{O-H}O-H | 463 |
a.[3]
Calculate the energy transferred to break all the bonds in the reactants.
b.[3]
Calculate the energy transferred when all the bonds form in the products.
c.[2]
Use your answers to parts (i) and (ii) to calculate the overall energy change for this reaction.