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CGP EDU Academic Team
Published on: August 14, 2026
The heat of atomixation of methane and ethane are 360 kJ/mol and 620 kJ/mol, respectively. The longest wavelength of light capable of breaking the C-C bond is :
(A vogadro number = 6.02 × 10 23 , h = 6.62 × 10 –34 J s):
Text Solution
Verified by ExpertsThe correct answer is:
B
CH 4 (g) 
C(g) + 4H(g)
⇒ 4 × E C–H = 360 KJ/Mol. ⇒ E C–H = 90 KJ/Mol.
and C 2 H 6 (g) 
2C(g) + 6H(g)
⇒ E C–C + 6 × 90 = 620 ⇒ E C–C = 80 kJ/mol
⇒ N A × 
= 80 × 1000 J
λ = 
= 14.9 × 10 –7 m = 1.49 × 10 –6 m = 1.49 × 10 3 nm.
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