Resonance in can be represented as:
The enthalpy of formation of
is 80 kJ mol.
The magnitude of resonance energy of is kJ mol (nearest integer value)
Given: Bond energies of , , , and are 940,

Question

Resonance in  can be represented as:
 The enthalpy of formation of
 is 80 kJ mol.
The magnitude of resonance energy of  is  kJ mol (nearest integer value)
Given: Bond energies of , , ,  and  are 940, 410, 500 and 602 kJ mol respectively.

Valence of X: 3, Y: 2

Canvas Classes · Accepted Answer

Step 1: Identify the molecule

with valence X = 3, Y = 2. This resembles  (nitrous oxide):  ↔

Step 2: Calculate

Given:  kJ mol (experimental)

But the formation reaction given is:
,  kJ mol

So  kJ mol

Step 3: Calculate  using bond energies

Bonds broken (reactants):
- 1 mol : +940 kJ
-  mol :  kJ

Total energy input = 940 + 301 = 1241 kJ

Bonds formed in  (theoretical structure, using average of resonance structures):

The two resonance structures are:
- Structure 1:  (one X=X double bond

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