Write the balanced chemical equation for the fluorination of methane to difluoromethane. Use bond enthalpies (Tables 4E.2 and 4E.3) to estimate the enthalpy of this reaction. The corresponding reaction using chlorine is much less exothermic. To what can this difference be attributed?

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TABLE 4E.2 Bond Enthalpies of Diatomic Molecules Molecule H N 0 CO F Cl Br 1 HF HCI HBr HI AHB/(kJ.mol-) 436 944 496 1074 158 242 193 151 565 431 366 299