Calculate the Cl-Cl bond enthalpy in CH2ClCH2Cl. ?

Calculate the Cl-Cl bond enthalpy in CH2ClCH2Cl, given the bond enthalpies in the table and the standard enthalpy of the reaction:
CH2=CH2 + Cl2 --> CH2ClCH2Cl
Standard enthalpy: -217.4 KJmol-1
Bond Bond enthalpy
C-C (+348)
C=C (+612)
C-H (+413)
Cl-Cl (+242)
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