Some mean bond enthalpies are given in the table.
| Bond | Bond enthalpy / kJ mol−1\text{kJ~mol}^{-1}kJ mol−1 |
|---|---|
| N≡N\text{N}\equiv\text{N}N≡N | 944 |
| H−H\text{H}-\text{H}H−H | 436 |
| N−H\text{N}-\text{H}N−H | 388 |
What is the enthalpy change, in kJ mol−1\text{kJ~mol}^{-1}kJ mol−1, for the following reaction?
N2(g)+3H2(g)→2NH3(g) \text{N}_2\text{(g)} + 3\text{H}_2\text{(g)} \rightarrow 2\text{NH}_3\text{(g)} N2(g)+3H2(g)→2NH3(g)+1088+1088+1088
+76+76+76
−76-76−76
−948-948−948
