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Question

The heat of formation of ethylene is 12.5 kcal. Calculate C=C bond energy in ethylene from the following data. Heat of atomisation of C=170.1 kcal/mole, heat of atomisation of H=52.1 kcal/mole, bond energy of C-H=99.3 kcal/mole.

A
1.50 kcal/mol
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B
140.5 kcal/mol
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C
130 kcal/mol
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D
160.5 kcal/mol
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Solution

The correct option is B 140.5 kcal/mol
C(s)2 moleC(g); ΔH=2×170.9 kcal

2H2(g)4H(g); ΔH=4×52.1 kcal

Given, 2C(s)+2H2(g)C2H4(g)

ΔH=2×170.9+4×52.14×99.3x

12.5=2×170.9+4×52.14×99.3x

x=140.5 kcal/mole

Thus, the bond energy of C= C bond = 140.5 kcal/mole

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