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Nitrogen

37. If C.C bo...

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37. If C.C bond energy is 348 kJmol-1 , C.H bond energy us 412 KJ mol-1 and H-H bond energy is 436 KJ mol-1, the Pauling electro negativity of C is about(Given electro negativity of H=2.1)

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H_{2} (g) + \frac{1}{2} O_{2} (g) ⟶ H_{2} O (g)

Δ H = - 242 k J m o l^{- 1}

H_{2}

O_{2}

436

500

k J

^{- 1}

respectively. The bond energy of O

-

H - H

bond energy is 430 kJ mol

^{- 1}

C l - C l

bond energy is 240 kJ mol

^{- 1}

Δ H_{f}

H C l

- 90

H - C l

(420 + x)

^{- 1}

x

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

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

C \equiv C

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

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}

Q. Bond dissociation energy of

C H_{4} is 360 k J m o l^{- 1}

C_{2} H_{6} is 620 k J m o l^{- 1}

. Then bond dissociation energy of

C - C

Q. Find the enthalpy of formation of hydrogen flouride on the basis of following data:
Bond energy of

H - H b o n d = 434 k J m o l^{- 1}

F - F b o n d = 158 k J m o l^{- 1}

H - F b o n d = 565 k J m o l - 1

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