Atomic Structure - Result Question 103

####79. Iodine molecule dissociates into atoms after absorbing light to 4500\AA. If one quantum of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms. (Bond energy of I2=240kJmol1 )

(1995, 2M)

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Answer:

Correct Answer: 79. (660nm)

Solution:

  1. After breaking of the bond of I2 molecule, the remaining energy would be distributed uniformly to iodine atoms as their kinetic energy, i.e.

E( energy of photon )= Bond energy +2× kinetic energy

6.625×1034×3×1084500×1010=240×1036.023×1023+2×Ek Ek=2.16×1020J/ atom 



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