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Question
The bond dissociation energy of methane and ethane are 360 kJ mol–1 and 620 kJ mol–1 respectively. Then, the bond dissociation energy of the C-C bond is
Options
170 kJ mol–1
50 kJ mol–1
80 kJ mol–1
220 kJ mol–1
Solution
80 kJ mol–1
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\[\ce{Ca_{(s)} + Cl2_{(g)} -> CaCl2_{(s)}}\] ∆`"H"_"f"^0` = − 795 kJ mol−1
Sublimation: \[\ce{Ca_{(s)} -> Ca-{(g)}}\] ∆`"H"_1^0` = + 121 kJ mol−1
Ionisation: \[\ce{Ca_{(g)} -> Ca^2+_{(g)} + 2e^-}\] ∆`"H"_2^0` = + 2422 kJ mol−1
Dissociation: \[\ce{Cl2_{(g)} -> 2Cl_{(g)}}\] ∆`"H"_3^0` = + 242.8 kJ mol−1
Electron affinity: \[\ce{Cl_{(g)} + e^- -> Cl^-_{(g)}}\] ∆`"H"_4^0` = −355 kJ mol−1
