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Using the bond enthalpy data, calculate ...

Using the bond enthalpy data, calculate `DeltaH` of the following reaction:
`2Cl_(2)(g)+2H_(2)O(g)to4HCl(g)+O_(2)(g)`
given that, bond energies of Cl-Cl,H-Cl,O-H and O=O are 242.8, 431.8,464 and `442kJ" "mol^(-1)` respectively.

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`172.4kJ" "mol^(-1)`
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