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Mathematics of Dipole Moment

Use the follo...

Question

Use the following data to answer the question below.
Calculate the resonance energy of anthracene:

84 kcal/mol

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100 kcal/mol

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110 kcal/mol

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116 kcal/mol

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Solution

The correct option is A 84 kcal/mol
Resonance energy = Theoretical heat of hydrogenation – Experimental heat of hydrogenation.
So theoretical heat of hydrogenation (H.O.H.) for anthracene is
Theoretical $Δ H = 7 \times (- 28.6) = - 200.2$ kcal/mol
Experimental $Δ H = - 116.2$ kcal/mol
Resonance energy = 84 kcal/mol

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Similar questions

Cyclohexene H_{2} - \to N i Cyclohexane; Δ H = - 28.6 kcal/mol

Anthracene H_{2} - \to N i Tetradecahydroanthracene; Δ H = - 116.2 kcal/mol

x kcal/mol

x

K I

- 78.31 k c a l m o l^{- 1}

I E (K) = 4.3 e V

E A (I) = - 73.4 k c a l m o l^{- 1}

I_{2}

36.1 k c a l m o l^{- 1}

K

21.51 k c a l m o l^{- 1}

e V

=

23.06 k c a l

6600 \circ A

C l - F

(61 k c a l m o l^{- 1})

F - F

(38 k c a l m o l^{- 1})

C l - C l

(58 k c a l m o l^{- 1})

4.0

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