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Iodine Molecue dissociates into atoms after absorbing light of 4500 A. If oone quantum of radiation is absorbed by each molecule, calculate K.E. of iodine atoms.

Vishrant Vasavada , 15 Years ago
Grade 11
anser 1 Answers
deeksha sharma

Last Activity: 14 Years ago

WAVELTH=4500*10-10 m

energy=hc/wavelength=6.62*10-34 *3*108 /4500*10-10 =4.4*10-19 J

half of this energy goes to each atom i.e. 2.2*10-19 J

bond energy of iodine= 240kj/mol = 3.9*10-19 J/atom

for one atom=1.95*10-19 J

ke of iodine atoms= (2.2-1.95)*10-19 J =0.25*10-19 J=2.5*10-20 J

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