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Per NCERT §5.5(c), in CH₄ atomisation requires 1665 kJ/mol. What is the MEAN C-H bond enthalpy?
A416 kJ/mol (≈ 1665 / 4)
B427 kJ/mol
C100 kJ/mol
D1665 kJ/mol
Answer & Solution
Correct answer: A. 416 kJ/mol (≈ 1665 / 4)
Per NCERT §5.5(c), mean C-H = Δ_a H°/4 = 1665/4 ≈ 416 kJ/mol. Individual successive C-H bond dissociations differ (427, 439, 452, 347).
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