Notifications
Clear all
1
29/09/2021 12:48 pm
Topic starter
The enthalpy of hydrogenation of cyclohexene is -119.5 kJ mol–1. If resonance energy of benzene is -150.4 kJ mol–1, its enthalpy of hydrogenation would be
(a) -208.1 kg mol–1
(b) -269.9 kg mol–1
(c) -358.5 kg mol–1
(d) -508.9 kg mol–1
1 Answer
1
29/09/2021 12:50 pm
Correct answer: (a) -208.1 kg mol–1
Explanation:
= – 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)
= -208.1 kJ