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Calculate the enthalpy change during the...

Calculate the enthalpy change during the reaction `:`
`H_(2(g))+Br_(2(g))rarr 2HBr_((g))`
Given, `e_(H-H)=435kJ mol^(-1),e_(Br-Br)=192kJ mol^(-1)` and `e_(H-Br)=368kJ mol^(-1).`

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`-109 kJ mol^(-1)`
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