Calculate the \( \mathrm{C}-\mathrm{C} \) bond enthalpy from the following data: (a) \( \mathrm{...

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Calculate the \( \mathrm{C}-\mathrm{C} \) bond enthalpy from the following data:
(a) \( \mathrm{C}(\mathrm{s}) \rightarrow \mathrm{C}(\mathrm{g}) ; \Delta \mathrm{H}=170 \mathrm{kcal} \)
(b) \( \frac{1}{2} \mathrm{H}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}(\mathrm{g}) ; \Delta \mathrm{H}=52 \mathrm{kcal} \)
(c) Heat of formation of ethane \( =-20 \mathrm{kcal} \)
(d) \( \mathrm{C}-\mathrm{H} \) bond enthalpy \( =99 \mathrm{kcal} \).
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