Question
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
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2.2 x 10-19 J
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2.0 x 10-19 J
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4.0 x 10-20 J
Solution
A.
2.0 x 10-20 J
KE of molecule = energy absorbed by molecules - BE per molecule
= [4.4 x 10-19)-(4.0 x 10-19) J
= 0.4 x 10-19 J
KE per atom 0.4 x 10-19/2 J = 2.0 x 10-20 J
