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(i) From the following data:
Enthalpy of formation of \( \mathrm{C}_{2} \mathrm{H}_{6}=-83 \mathrm{~kJ} / \mathrm{mol} \)
Enthalpy of sublimation of graphite \( =719 \mathrm{~kJ} / \mathrm{mol} \)
Enthalpy of bond dissociation of \( \mathrm{H}_{2}=435 \mathrm{~kJ} / \mathrm{mol} \)
\( \mathrm{C}-\mathrm{H} \) bond enthalpy \( =414 \mathrm{~kJ} / \mathrm{mol} \)
Calculate the bond enthalpy of \( \mathrm{C}-\mathrm{C} \) bond.
(ii) By using data of above question calculate bond enthalpy of \( \mathrm{C} \equiv \mathrm{N} \) if enthalpy of formation of \( \mathrm{CH}_{3} \mathrm{CN}=87 \mathrm{~kJ} / \) \( \mathrm{mol} \) and enthalpy of bond dissociation of nitrogen \( = \) \( 945 \mathrm{~kJ} / \mathrm{mol} \).
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