Published by:
CGP EDU Academic Team
Published on: August 13, 2026
AB, A 2 and B 2 are diatomic molecules. If the bond enthalpies of A 2 , AB & B 2 are in the ratio 1 : 1 : 0.5 and enthalpy of formation of AB from A 2 and B 2 is – 100 kJ/mol –1 . What is the bond enthalpy of A 2 .
Text Solution
Verified by ExpertsThe correct answer is:
A
A – A + 
B – B ⎯→ AB Δ H = – 100 KJ/mole
x + 
(0.5x) – x = – 100 
+ 0.25x – x = – 100
– 0.25 x = – 100 
x = 400 KJ/mole
Bond enthalpy = 400 kJ/mol.
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