Question

The H–Br bond energy is 142 kJ/mol. Therefore the formation of a single bond between atoms The H–Br bond energy is 142 kJ/mol. Therefore the formation of a single bond between atoms should require the absorption of 284 kJ per mole of H–Br formed. should result in the release of 142 kJ per mole of H–Br formed. should require the absorption of 142 kJ per mole of H–Br formed. should result in the release of 284 kJ per mole of H–Br formed.

Answer 1

the energy required to break the bonds between the atoms is called bond energy.

Energy required (bond energy) > 0.

Energy formation < 0

energy required to break = 143 kJ / mol of H-Br

energy required to form = - 143 kJ / mol of H-Br

Negative sign shows that the formation of bond is exothermic process

Positive sign shows that the breaking of bond is endothermic process

Therefore the formation of a single bond between atoms should result in the release of 142 kJ per mole of H–Br formed.