Question

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

(1.) 4.0 X 10-20 J

(2.) 2.0 X 10-20 J

(3.) 2.2 X 10-19 J

(4.) 2.0 X 10-19 J

Answer 1

Here is your answer
***________


K.E per atom=
energy absorbed-bond energy
________________________
no.of atoms in the molecule

As it is not mentioned in the question, assume the molecule is diatomic

Thus,

K.E per atom =4.4 x 10^−19 − 4 x 10−19 /2 = 0.4 x 10^−19/ 2= 2 x 10^−20 j

Hence correct option is (2)

It should be noted that the denominator will be the no. of atoms in the molecule.

Answer 2

The answer is provided in the attachment.

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