Chemical Thermodynamics Question 381
Question: The enthalpy of hydrogenation of cyclohexene is $ -119.5kJmo{{l}^{-1}} $ . If resonance energy of benzene is $ -150.4kJmo{{l}^{-1}} $ , its enthalpy of hydrogenation would be
Options:
A) $ -208.1kgmo{{l}^{-1}} $
B) $ -269.9kgmo{{l}^{-1}} $
C) $ -358.5kgmo{{l}^{-1}} $
D) $ -508.9kgmo{{l}^{-1}} $
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 $ \Delta H=-358.5-( -150.4 )=-208.1kJ $
