The energy absorbed by each molecule A2 of a substance is 4.4  ×  10−19  J and bond energy per molecule is 4.0  ×  10−19  J. The kinetic energy of the molecule per atom will be

KE of molecule = energy absorbed by molecule                                      - BE per molecule=4.4  ×  10−19 − 4.0  ×  10−19J = 0.4  ×  10−19JKE per  atom=0.4  ×  10−192J =  2.0  ×  10−20 J