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Calculate the enthalpy change of 1 mole ...

Calculate the enthalpy change of 1 mole of reaction
`Na(s)+(1)/(2)Br_(2)(g)rarrNaBr(s)` in kcal
Given : `Delta H_("sub")(Na)=137 kJ "mole"^(-1) , DeltaH_("bond dissociation")(Br_(2)(g))=144 kJ "mole"^(-1)`
`Delta H_("1 st ionisation")(Na(g)=496 kJ "mole"^(-1) , Delta H_(1 st "electron affinity")(Br(g)=-325 kJ "mole"^(-1)`
`Delta H_("Lattice energy")(NaBr)= +742`

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