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Iodine molecule dissociates into atoms after absorbing light of 4500 Å. If one quantum of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms.(Bond energy of I2 = 240 kJ mol-1)

Simran Bhatia , 10 Years ago
Grade 11
anser 1 Answers
Aditi Chauhan

Last Activity: 10 Years ago

Bond energy of I2 240kJ mol-1 = 240 * 103 J mol-1
= 240 *103/6.023 *1023 J molecule-1
= 3.984 *10-19 J molecule-1
Energy absorbed = hc/λ = 6.626 *10-34 Js *3 *108 ms-1/4500 *10-10 m
= 4.417 * 10-19 J
Kinetic energy = Absorbed energy – Bond energy
∴ Kinetic energy = 4.417 *10-19 – 3.984 *10-19 J
= 4.33 * 10-20 J
∴ Kinetic energy of each atom of iodine
= 4.33 *10-20/2 = 2.165 *10-20

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