Chemical Thermodynamics Question 240
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) $ -208.1\ \text{kg}\cdot\text{mol}^{-1} $
B) $ -269.9\ \text{kg}\cdot\text{mol}^{-1} $
C) $ -358.5\ \text{kg}\cdot\text{mol}^{-1} $
D) $ -508.9\ \text{kg}\cdot\text{mol}^{-1} $
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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 $
BETA
