A Common Way of Initiating Certain Chemical Reactions with Light $\Delta$

question 56

Multiple Choice

A common way of initiating certain chemical reactions with light involves the generation of free halogen atoms in solution. If $\Delta$ H for the reaction Cl₂(g) $\rarr$ 2Cl(g) is 242.8 kJ/mol, what is the longest wavelength of light that will produce free chlorine atoms in solution?

• A)246.3 nm
• B)465.2 nm
• C)349.3 nm
• D)698.6 nm
• E)492.6 nm

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