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Question

# Calculate the wavelength of the radiation that would cause photo dissociation of chlorine molecule if the Cl−Cl bond energy is 240 kJ/mol. (take Avogadro's number to be 6×1023, and Planck's constant (h) = 6.6×10−34 J s)

A
8.72×107 m
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B
9.25×1010 m
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C
10.42×1022 m
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D
4.95×107 m
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Solution

## The correct option is D 4.95×10−7 mBond Energy of one mole of Cl2=240 kJ/mol Bond energy per molecule of Cl2 =energy for one mole in joulesAvogadro's number Energy per molecule =2400006×1023=40×10−20 Wavelength of radiation, E=hcλ 40×10−20=6.6×10−34×3×108λ λ=4.95×10−7 m

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