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Q.

The bond energy of C=O if ΔHf∘CO2=−390kJ , ΔHsublimation ∘ (Graphite)= 720 kJ, 0 = 0 bond energy = 490 kJ and resonance energy CO2=36kJ:

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a

782 kJ

b

626 kJ

c

500 kJ

d

1564 kJ

answer is A.

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Detailed Solution

In the reaction we have,

C(gr)+O2(g)⟶CO2(g)

ΔHf∘ (thee) =720+490−2x

ΔHf∘(exp)−ΔHf∘( theo )=−R⋅E−390−1210+2x=−36

⇒ x=782

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