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Standard XII

Chemistry

Nucleophilic Substitution Reaction

11 calculate ...

Question

11 calculate the resonance energy of C6H6 using Kekule formula for C6H6-Given delta H0f for C6H6=-358.5 kJ/mol heat of atomisation of C=716.8 kJ/mol Bond energy of C-H ,C-C ,C=C and H-H are 490,340,620,436.9 kJ/mol resp.

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Q. Calculate the resonance energy of

C_{6} H_{6}

, using Kekule formula for

C_{6} H_{6}

from the following data: (i)

Δ H^{\circ}

for

C_{6} H_{6} = - 358.5 k J m o l^{- 1}

(ii)

H e a t o f a t o m i s a t i o n o f C = 716.8 k J m o l^{- 1}

(iii) Bond energy of

C - - H, C - - C, C = = C

and

H - - H

are 490, 340, 620 and

436.9 k J m o l^{- 1}

. Report your answer in kj (only value).

Q. Using the data provided, calculate the multiple bond energy

(k J m o l^{- 1})

of a

C \equiv \equiv C

bond in

C_{2} H_{2}

. Given that the heat of formation of

C_{2} H_{2}

225 k J m o l^{- 1}

(take the bond energy of a

C - - H

bond as

350 k J m o l^{- 1}

)

2 C (s) ⟶ 2 C (g); Δ H = 1410 k J m o l^{- 1}

H_{2} (g) ⟶ 2 H (g); Δ H = 330 k J m o l^{- 1}

Q. Use the following data to calculate second electron affinity of oxygen for the process

O^{-} (g) + e^{-} (g) \to O^{2 -} (g)

.
Heat of sublimation of

M g (s) = 147.7 k J / m o l

Ionisation energy of

M g (g)

to form

M g^{2 +} (g) = 2189 k J / m o l

Bond dissociation energy for

O_{2}

= 498.4 k J / m o l

First electron affinity of

O (g) = - 141 k J / m o l

Heat formation of

M g O (s) = - 601.7 k J / m o l

lattice energy of

M g O = - 3791 k J / m o l

The heat of combustion for $C$ , $H_{2}$ and $C H_{4}$ are $- 349$ kJ/mol, $- 241.8$ kJ/mol and $- 906.7$ kJ/mol respectively. The heat of formation in kJ/mol of $C H_{4}$ is :

Q. Using the data provided, calculate the multiple bond energy

(k J m o l^{- 1})

of a

C \equiv C

bond in

C_{2} H_{2} .

Given that the heat of formation of

C_{2} H_{2} = 225 k J m o l^{- 1} .

(take the bond energy of

C - H

bond as

350 k J m o l^{- 1}

2 C (s) \to 2 C (g) △ H = 1410 k J m o l^{- 1}

H_{2} (g) \to 2 H (g) △ H = 330 k J m o l^{- 1}

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