The energy absorbed by each molecule (A₂) of a substance is 4.4 x 10^-19 J and bond energy per molecule is 4.0 x 10^-19 J. The kinetic energy of the molecule per atom will be :

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2.0 x 10^-20 J

2.2 x 10^-19 J

2.0 x 10^-19 J

4.0 x 10^-20 J

answer is A.

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Detailed Solution

A₂ → 2A
E given = 4.4 x 10^-19 J
E of A atoms = 4 x 10^-19J
K.E. of molecule for 2 atom
$= 4 .4 \times 10^{- 19} J - 4 \times 10^{- 19} J = 0 .4 \times 10^{- 19} J ∴ K.E./atom = \frac{0 .4 \times 10^{- 19}}{2} = 2 \times 10^{- 20}$

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