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Question

The dissociation energy of H2 is 430.53 kJ mol1. If hydrogen is dissociated by illumination with radiation of wavelength 253.7 nm, the fraction of the radiant energy which will be converted into kinetic energy is given by


A

1.22%

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B

8.76%

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C

2.22%

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D

100%

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Solution

The correct option is B

8.76%


Energy of 1 mol of quanta =hvNA=hcN4λ
=6.63×1034×3×108×6.23×1023253.7×109=472.2kJ
Energy converted into kinetic energy
= 472.2 - 430.53 kJ
% of radiant energy converted into kinetic energy
=(472.2430.53)×100472.2=8.82


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