Chemistry - Thermochemistry Question with Solution | TestHub
ChemistryThermochemistryBond EnthalpyHard2 minQB
ChemistryHardsingle choice
Calculate the enthalpy change for the isomerisation
(A) to (B), using the following data: bond enthalpies (kJ/mol) 610, 348, 413; resonance (conjugation) energy of A = 0, of B = 28 kJ/mol.
Options:
Answer:
A
Solution:
Count the bonds: A and B each have 2 , 2 and 8 bonds, so the bond-enthalpy change is zero.
B gains 28 kJ/mol of conjugation stabilisation over A.
.
Answer: (A).
Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Bond Enthalpy
⏱ 2mℹ️ Source: QB
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