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

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2.0 × 10−20 J

2.2 × 10−19 J

2.0 × 10−19 J

4.0 × 10−20 J

answer is A.

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Detailed Solution

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

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