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sp2 Hybridisation

The enthalpy ...

Question

The enthalpy of formation of ethane, ethylene and benzene from the gaseous atom are -2839.2,-2275.2and -5506 kJ mol respectively. Calculate the resonance energy of benzene. The bond enthalpy ofC-H bond is given as equal to +410.87 kd/mol.

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Q. Using the data (all values are in

k J / m o l

25^{o} C

(i) Enthalpy of polymerization of ethylene

= - 72

(ii) Enthalpy of formation of benzene

(l) = 49

(iii) Enthalpy of vaporization of benzene

(l) = 30

(iv) Resonance energy of benzene

(l) = - 152

(v) Heat of formation of gaseous atoms from the elements in their standard states

H = 218, C = 715

.

Average bond energy of

C - H = 415

. Calculate the

B . E

C - C

C = C

Q. Heat of dissociation of benzene to elements is

{5535 KJ mol}^{- 1}

. The bond enthalpies of

C - C, C = C

C - H

347.3, 615.0

416.2

KJ respectively. Resonance energy of benzene is:

Q. The enthalpy of hydrogenation of benzene is -207 kJ/mol and its resonance energy is -150 kJ/mol. Calculate the enthalpy of hydrogenation

- △ H

in kJ/mol for 1,4-cyclohexadiene.

Q. The enthalpy of combustion of one mole of benzene, carbon and hydrogen are

- 3267 k J / m o l, - 393.5 k J / m o l

- 285.8 k J / m o l

respectively. Calculate the standard enthalpy of formation of benzene.

Q. Calculate the enthalpy of formation of water, given that the bond energies of

H - - H

O - - O

O - - H

433 k J m o l^{- 1}

492 k J m o l^{- 1}

464 k J m o l^{- 1}

, respectively.

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