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The energy absorbed by each molecule (A2...

The energy absorbed by each molecule `(A_2)` of a substance is `4.4 xx 10^(-19)` J and bond energy per molecule is 4.0 x 10-19 J. `4.0 xx 10^(-19)` J . The kinetic energy of the molecule per atom will be

A

`2.2 xx 10^(-19)J`

B

`2.0 xx 10^(-19) J `

C

`4.0 xx 10^(-20)J`

D

`2.0 xx 10^(-20)J`

Text Solution

Verified by Experts

The correct Answer is:
D
Energy absorbed by each molecule =`4.4 xx 10^(-19)`J
Energy required to break the bond = `4.0 xx 10^(-19) J`
Remaining energy gets converted to kinetic energy
`=(4.4 xx 10^(-19) - 4.0 xx 10^(-19))J`
`=0.4 xx 10^(-19) J` per molecule
`:.` Kinetic energy per atom `= 0.2 xx 10^(-19) J = 2 xx 10^(-20) J`
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