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Question

# The dissociation energy of H2 is 430.53 kJ mol−1. If H2 is exposed to radiant energy of wavelength 253.7 nm. What % of radiant energy will be converted into kinetic energy?

A
91.3%
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B
8.7%
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C
9.5%
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D
90.5%
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Solution

## The correct option is B 8.7%EH−H bond dissociation=430.53×1036.023×1023J per molecule =7.15×10−19J per moleculeEphoton=hcλ=6.626×10−34×3.0×108253.7×10−9 =7.83×10−19JEnergy converted into kinetic energy = Energy left after dissociation of the bond.∴ Energy converted into KE=(7.83−7.15)×10−19J=0.68×10−19J∴% of energy converted into KE=0.68×10−197.83×10−19×100=8.68%Hence, the correct option is B

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