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calculate the lowest frequency of UV. light which has enough energy to break a Cl-Cl bond. ( bond energy =243kj/mol). I got 7.89E14 but the answer is 6.14E14s–¹. how?

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I saw the solution as ..E for 1 molecule is 243kj/mol / 6.022E23 molecules. I don't seem to understand that part.

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