Question

34. AH, C2H4 = 12.5 kcal
Heat of atomisation of C = 171 kcal
Bond energy of H, = 104.3 kcal
Bond energy C - H = 99.3 kcal
What is C = C bond energy?
(1) 140.9 kcal
(2) 49 kcal
(3) 40 kcal
(4) 76 kcal


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Answer 1

Answer:

Reaction 2C+2H

2

⟶C

2

H

4

Heat of formation = B.E of reagents - B.E. of products

ΔH

f

=2× Binding energy of carbon +2× Binding energy of H

2

+4× bond energy of C−H - Bond energy of C=C

12.5=2×171+2×104.3+4×99.3−Bond energy of C=C

Bond energy of C=C=140.9Kcal

Explanation:

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