17Enthalpy Cycles Bond EnthalpiesMedium1 mark
The equation for the reaction between hydrogen and chlorine is shown.
The energy required to break the H–H bond is 436 kJ / mol.
The energy required to break the Cl–Cl bond is 242 kJ / mol.
The energy released when making the H–Cl bond is 431 kJ / mol.
Which row shows the overall energy change in kJ / mol and identifies the type of reaction?
| energy change in kJ / mol | type of reaction | |
|---|---|---|
| A | 184 | endothermic |
| B | 184 | exothermic |
| C | 247 | endothermic |
| D | 247 | exothermic |