Question

Bond dissociation energy of CH is 360 kJ/mol and CH is 620 kJ/mol. Then bond dissociation energy of C - C bond is

• A. 170 kJ/mol
• B. 50 kJ/mol
• C. 80 kJ/mol
• D. 220 kJ/mol

Answer 1

Answer: (C)

80 kJ/mol

Answer 2

Dissociation energy of methane = 360 kJ mol ? Bond energy of C ??H bond $=\frac{360}{4}$ = 90 kj Bond energy of ethane, 1r(C ??C) + 6 (C ??H) = 620 kJ/mol (C ??C) + 6 ??90 = 620 (C ??C) + 540 = 620 C ??C = 620 - 540 C ??C = 80 kJ mol. Bond dissociation of C ??C bond = 80 kJ mol.