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Calculate the C-C bond enthalpy from the...

Calculate the C-C bond enthalpy from the following data:
(a) `C(s) rarr C(g) , Delta H=170 kcal` (b) `(1)/(2)H_(2)(g)rarrH(g), Delta H= 52 kcal`
(c) Heat of combustion of ethane `= -20 kcal` (d) C-H bond enthalpy `= 99 kcal`.

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The correct Answer is:
78 Kcal
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