НаС, CH3 НаС. Н c=C Н c=C CH3 trans-2-butene Н н cis-2-butene

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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The molecule 2-butene, C4H8, can undergo a geometric change called cis-trans isomerization. (Figure 1) Such transformations can be induced by light and are the key to human vision. Rotation about the C=C bond, which breaks the π bond, is required for the isomerization.

The average bond energy (enthalpy) for a C=C double bond is 614 kJ/mol and that of a C−C single bond is 348 kJ/mol. Estimate the energy needed to break only the π bond of the double bond of 2-butene.
Express your answer numerically in joules per molecule.

 

НаС,
CH3
НаС.
Н
c=C
Н
c=C
CH3
trans-2-butene
Н
н
cis-2-butene
Transcribed Image Text:НаС, CH3 НаС. Н c=C Н c=C CH3 trans-2-butene Н н cis-2-butene
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