Some bond enthalpies are given.
| Bond | C−C\text{C}-\text{C}C−C | C=C\text{C}=\text{C}C=C | C−H\text{C}-\text{H}C−H | H−H\text{H}-\text{H}H−H |
|---|---|---|---|---|
| Bond enthalpy / kJ mol−1\text{kJ~mol}^{-1}kJ mol−1 | 348 | 612 | 413 | 436 |
Which is the enthalpy change of this reaction in kJ mol−1\text{kJ~mol}^{-1}kJ mol−1?
C2H4(g)+H2(g)→C2H6(g) \text{C}_2\text{H}_4\text{(g)} + \text{H}_2\text{(g)} \rightarrow \text{C}_2\text{H}_6\text{(g)} C2H4(g)+H2(g)→C2H6(g)−126-126−126
+126+126+126
−700-700−700
+700+700+700