Question

"It has been found that gaseous iodine molecule
just dissociates into iodine atoms after absorption
of light at wavelengths 4995 Å. The energy required
to dissociate 1 mole of iodine molecules is​

Answer 1

Answer:

Energy given to Iodine molecule = hc/λ

                                            = 6.62 × 10^-34 × 3 × 10^8 ÷ 4500× 10^-10

                                             =4.417 × 10^-19 J

also, energy used for braking up iodine molecule = 240 × 10^3 ÷ 6.023 × 10 ^23 =3.984× 10^-19 J

(bcoz B.E. is given in per mole and we have to find out per molecule)

 

Energy used in imperting Kinetic energy to two I atoms = [4.417 -3.984] × 10 ^-19 J

so K.E per iodine atom = [4.417-3.984/2] × 10^-19

                                 = .216 × 10^-19 J

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