AB,A2 and B2 are diatomic molecules If the bond energy of A2,AB and B2 are in the ratio 1:1:0 5 - Chemistry - Thermodynamics

Question

AB,A2 and B2 are diatomic molecules If the bond energy of A2,AB and
B2 are in the ratio 1:1:0 5 and enthalpy of formation of AB from A2
and B2 is -100 kJ/mol What is the bond enthalpy of A2?

Adbsfbhs · Answer

let energy of formation of A2 be E,
then reaction is
1/2 A2 +1/2 B2 -> AB
energy of o 5 mol A2 bond = 0 5 E
energy of o 5 mol B2 bond = 0 5 E/2 (as ratio is 0 5)

energy of 1 mol AB = E (as ratio 1)

total energy = E- 0 75E=0 25E that is -100
so E=-400kj/mol
​Answer

AB,A2 and B2 are diatomic molecules.If the bond energy of A2,AB and B2 are in the ratio 1:1:0.5 and enthalpy of formation of AB from A2 and B2 is -100 kJ/mol.What is the bond enthalpy of A2?