Question

What is the bond enthalpy of the chlorine molecule (Cl2) in kilojoules per mole? Use the given bond enthalpies in kJ/mol: Cl-Cl bond = 242 kJ/mol. Show your calculations and explain the process of determining the bond enthalpy of a molecule.

Answer 1

The bond enthalpy of a molecule is the amount of energy required to break a specific chemical bond in the molecule. In this case, we are given the bond enthalpy of the Cl-Cl bond in a chlorine molecule  Cl2  as 242 kJ/mol. Since there is only one Cl-Cl bond in the Cl2 molecule, the bond enthalpy of the entire molecule is equal to the bond enthalpy of the Cl-Cl bond.Calculations:Bond enthalpy of Cl2 = Bond enthalpy of Cl-Cl bondBond enthalpy of Cl2 = 242 kJ/molTherefore, the bond enthalpy of the chlorine molecule  Cl2  is 242 kJ/mol.