Question

gaseous iodine molecules dissociate into iodine atoms by absorbing light of wavelength 4995 Armstrong what is the minimum amount of energy in kilo joule per mole needed to dissociate I2 molecules into iodine atom if each molecule of I2 abs of one quarter of energy​

Answer 1

Answer:

Energy provided to Iodine molecule = hc/λ

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

=4.417 × 10^-19 J

also, energy used for breaking up iodine molecule = 240 × 10^3 / 6.023 × 10 ^23

=3.984× 10^-19 J

Energy used for providing 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

= 2.16 × 10^-20 J