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Calculate the electron gain enthalpy of ...

Calculate the electron gain enthalpy of fluorine atom using the following data. Make Born-Haber's cycle. All the values are in kJ `mol^(-1)` at `25^(@)C`. `DeltaH_("diss") (F_(2))=160, Delta_(f)H (NaF(s))=-571, I.E. [Na(g)]=494, DeltaH_("sub") [Na(s)]=101`. Lattice enthalpy of `NaF(s)=894`.

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The correct Answer is:
`-352" kJ mol"^(-1)`
`Na(s)+1/2 F_(2) rarr NaF" "[x=Delta_(eg)H]`
`-571=101+494+80+x-894`
`x=-352`
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