iodine molecule dissociates into atoms after absorbing light of 4500Å. if one quantam of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms. (bond energy of I2 = 240 kj mol-1 )find the number of quanta of radiations of frequency 4.67*1013 sec-1 that must be absorbed in order to melt 5gm of ice. the energy required to melt 1gm of ice is 333 j

Dear Vrashank,

We have, energy given to I₂ molecule    = h c/λ

= (6.626 ? 10^–34 ? 3.0 ? 10⁸)/(4500 ? 10^–10)

= 4.417 ? 10^–19 J

Energy used for breaking up of I₂ molecule = (240 ? 10³)/(6.023 ? 10²³)

= 3.984 ? 10^–19 J

Therefore, energy used in imparting K. E. to two iodine atoms = [4.417 – 3.984]?10^–19 J

= 0.216 ? 10^–19 J 

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