Question

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

Answer 1

Answer:

We have to calculate the Kinetic energy of the iodine atoms.

The Energy is given to Iodine molecule = hc/?

                           

= 6.62 × 10-34 × 3 × 108 / 4500× 10-10

= 4.417 × 10-19 J

The total energy needed can be calculated by  

E = hc / ? = 4.41 x 10-19 J

Energy absorbed by each atom is:

E (atom) = 2.205 x 10-19 J

Now Bond Energy of each molecule (B) = 3.98 x   J

So, for each atom 1.99 x 10-19 J  

So finally we will get:

Kinetic Energy of each atom = E(atom) - B (atom)

                        = 2.15 x 10-19 J

 

Answer 2

Refer the attachment for explanation of answer