Acommon way of initiating certain chemical reactions with light involves the generation of free halogen atoms in solution. if δh for the reaction cl 2(g) → 2cl(g) is 242.8 kj/mol, what is the longest wavelength of light that will produce free chlorine atoms in solution?

493.02 nm is the longest wavelength of light that will produce free chlorine atoms in solution.

Explanation:

,ΔH = 242.8 kJ/mol

Energy required to break 1 mole of Cl-Cl bond = 242.8 kJ

Energy required to break 1 Cl-Cl bond = E

Energy related with the wavelength of light is given by Planck's equation:

493.02 nm is the longest wavelength of light that will produce free chlorine atoms in solution.

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