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The bond dissociation energy for the H-H bond is the energy required to break the H2 molecule (in its most stable geometry) into separate hydrogen atoms.
Radiant energy = 1242 eV-nm / 253.7 nm = 4.895 eV = 7.843x10-19 J
1 mole of electrons is 6.022 x 1023 electrons
so radiant energy = 472.28 KJ/mol
dissoc. energy = 430.53 KJ/mol
KE = rad. enrgy - dissoc. energy
= 472.28 - 430.53
=41.75 KJ/mol
% of rad. enrgy to KE is = 41.75*100/472.28
= 8.84 %
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