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The heat of atomization of methane and ethane are 360kJ/mol and 620kJ/mol, respectively. The longest wavelength of light capable of breaking the C - C bond is (Avogadro number=6.02 \times 10^{23},h= 6.62 \times 10^{-34}\;Js)$: h56.62310234 J s) :

1.49×103nm2.48×103nm2.48×104nm1.49×104nm

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