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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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