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Answer the following question (Based on ...

Answer the following question (Based on `EA, Delta_(eg)H^(ɵ)` and `IE`).
`IE_(1)` of `Li` is `5.4 eV "atom"^(-1)` and the `EA` of `Cl` is `3.6 eV "atom"^(-1)`. Calculate `Delta_( r)H^(ɵ)` in `"kcal mol"^(-1)` and `kJ mol^(-1)` for the reaction
`Li_((g))+Cl_((g)) rarr Li_((g))^(o+)+Cl_((g))^(ɵ)`
formed at such a low pressure that resulting ions do not combine with each other.

Text Solution

Verified by Experts

The correct Answer is:
3
Overall reaction is divided into two partial equations as
`Li(g) to Li^(+) (g) +e^(-), triangleE_(1)=5.4eV`
`Cl(g)+e^(-) to Cl^(-) (g), triangleE_(2)=-3.5eV`
`triangleH=triangleE_(1)-triangleE_(2)=1.8eV=1.8 xx 23.06 =41.508" kcal mol"^(-1)`
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