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ntHeat of for...

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ntHeat of formation of C2H4 = 12.5 kcaln ntHeat of atomisation of C = 171 kcaln ntHeat of atomisation of H = 52.1 kcaln ntBond energy C-H = 99.3 kcaln ntWhat is C=C bond energy ?n ntn

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Δ H_{f}

C_{2} H_{4} = 12.5 k c a l

Heat of atomisation of

C = 171 k c a l

. Bond energy of

H_{2} = 104.3 k c a l

C - H = 99.3 k c a l

C = C

Q. The heat of combustion of acetylene is 312 kcal. If heat of formation of

C O_{2}

H_{2} O

are 94.38 and 68.38 kcal respectively,

C \equiv \equiv C

x k c a l

. Given that heat of atomisation of C and H are 150.0 and 51.5 kcal respectively and

C - - H

bond energy is 93.64 kcal. Value of

x

Q. Heat of atomisation of

N H_{3}

N_{2} H_{4}

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

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

respectively. Average bond energy of

N - - N

Q. The heat of atomisation of

P H_{3} (g)

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

P_{2} H_{4} (g)

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

. The energy of the

P - - P

bond is (in kcal):

Q. The heat of combustion of acetylene is 312 kcal. If heat of formation of

C O_{2}

H_{2} O

are 94.38 and 68.38 kcal respectively,

C \equiv \equiv C

x k c a l

. Given that heat of atomisation of C and H are 150.0 and 51.5 kcal respectively and

C - - H

bond energy is 93.64 kcal.

x

(nearest integer value) is _______.

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