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Question

The wavelength of the radiation that would cause photo dissociation of chlorine molecule is: [ClCl bond energy is 241 kJ/mol]

A
4.96×107m
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B
5.06×107m
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C
4.56×107m
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D
5.84×107m
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Solution

The correct option is A 4.96×107m
ClCl bond energy =241kJ/mol
1 mole =6.023×1023 molecules = Avogadro's Number
ClCl bond energy per molecule =241×1036.023×1023=4×1019J
Wavelength is given by hcλ=4×1019J
λ=6.62×1034×3×1084×1020=4.96×107m

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