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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro
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cis ?2?Butene isomerizes to trans-2-butene via the

Chapter 10, Problem 102E

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QUESTION:

cis-2-Butene isomerizes to trans-2-butene via the reaction

a. If isomerization requires breaking the \(\pi\) bond, what minimum energy is required for isomerization in J/mol? In J/molecule?

b. If the energy for isomerization came from light, what minimum frequency of light would be required? In what portion of the electromagnetic spectrum does this frequency lie?

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QUESTION:

cis-2-Butene isomerizes to trans-2-butene via the reaction

a. If isomerization requires breaking the \(\pi\) bond, what minimum energy is required for isomerization in J/mol? In J/molecule?

b. If the energy for isomerization came from light, what minimum frequency of light would be required? In what portion of the electromagnetic spectrum does this frequency lie?

ANSWER:

Problem 102Ecis-2-Butene isomerizes to trans-2-butene via the following reaction:a. If isomerization requires breaking the pi bond, what minimum energy is required forisomerization in J/mol In J/moleculeb. If the energy for isomerization comes from light, what minimum frequency of light isrequired In what portion of the electromagnetic spectrum does this frequency lie Step by step solutionStep 1 of 2(a)Consider the following reaction:The bond energy of the C=C isThis bond emery includes both and bonds.The bond energy of C-C, isThe isomerization requires breaking of the bond.Therefore, the energy required to breaking the x bond is,\nConvert the energy units using the conversion factor given below. 1 kJ = 1000 JThen,One mole of any substance contains Avogadro's number of molecules.since each molecule of cis 2 - Butene contains only one C = C bond, calculate the energyrequired to break one C = C bond as follows:Therefore, the energy required for isomerization is, or____________________________________________________________________________

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