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 xx 10^-19 J`. The kinetic energy of the molecule per atom will be.

Options

A. `4.0 xx 10^(-20)` J
B. `2.0 xx 10^(-10)J`
C. `2.2 xx 10^(-19)` J
D. `4 xx 10^(-19)` J

Answer

B

Explanation

`KE=4.4xx10^(-19)-4.0xx10^(-19)`
KE/ molecule `=0.4xx10^(19)`
`KE//"atom"=(0.4xx10^(19))/(2)`
`=2xx10^(-20)J`