Chemical Thermodynamics Question 381

Question: The enthalpy of hydrogenation of cyclohexene is 119.5kJmol1 . If resonance energy of benzene is 150.4kJmol1 , its enthalpy of hydrogenation would be

Options:

A) 208.1kgmol1

B) 269.9kgmol1

C) 358.5kgmol1

D) 508.9kgmol1

Show Answer

Answer:

Correct Answer: A

Solution:

  • =358.5,KJ The resonance energy provides extra stability to the benzene molecule so it has to be overcome for hydrogenation to take place. So ΔH=358.5(150.4)=208.1kJ


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