The longest wavelength of light capable of breaking a single chlorine-chlorine bond is 494mm.
The energy required to break one mole of Cl−Cl bonds in Cl₂ is 242 kJ mol⁻¹. The longest wavelength of light capable of breaking single Cl−Cl bond is 494mm(c=3×10⁸msec⁻¹,N= 6.023×10²³mol⁻¹). Bond energy is defined by the sum of all of the bonds broken minus the sum of all of the bonds formed: ΔH = ∑H(bonds broken) - ∑H(bonds formed). ΔH is the change in bond energy, also referred to as the bond enthalpy and ∑H is the sum of the bond energies for each side of the equation. Overall energy for a chemical reaction = Total energy of bond breaking + Total energy for bond forming. Remember, that the total energy for bond forming is always a negative value.
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