The energy absorbed by each molecule (A) of a substance is 4.4× 10 raise to - 19 J and bond enwrgy per molecule is 4.0× 10 raise to - 19 J. The kinetic energy of the molecule per atom will be
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As you may know, the Kinetic Energy of a molecule is the difference between energy absorbed by the molecules and the binding energy of the moleules. On putting the values from the question given the answer comes to 20*(10^(-20)). This will be the kinetic energy per molecule.