Use bond enthalpies (Tables 4E.2 and 4E.3) to estimate the reaction enthalpies for the hydrohalogenation of ethene by HX, where X = Cl, Br, I. What trend, if any, exists in these values?

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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