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CBSE Class 12-science Answered

The energy absorbed by each molecule (A2) of a substance is 4.4 × 10^-19 J and the bond energy per molecule is 4.0 × 10^-19 J. The kinetic energy of the molecule per atom will be ?
Asked by arunavamitra50 | 06 Jun, 2018, 08:25: PM
answered-by-expert Expert Answer
The molecule is diatomic (A2).
 
Given colon
Energy space absorbed space equals space 4.4 space cross times 10 to the power of negative 19 space end exponent straight J

Bond space energy space equals space 4 cross times 10 to the power of negative 19 end exponent space straight J

straight K. thin space straight E space per space atom space equals space fraction numerator Energy space absorbed minus space Bond space energy over denominator No. space of space atoms space in space the space molecule. end fraction

space space space space space space space space space space space space space space space space space space space space space space equals space fraction numerator space 4.4 space cross times 10 to the power of negative 19 space end exponent minus space space 4 cross times 10 to the power of 19 over denominator 2 end fraction

space space space space space space space space space space space space space space space space space space space space space space equals space fraction numerator 0.4 cross times 10 to the power of negative 19 space end exponent over denominator 2 end fraction

space space space space space space space space space space space space space space space space space space space space equals space 2 cross times 10 to the power of negative 20 space end exponent space straight J
The kinetic energy of the molecule per atom will be 2× 10-20 J.
 
Answered by Varsha | 07 Jun, 2018, 11:02: AM
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