પ્રક્રિયા ઉર્જાનો ફેરફાર (in \(kJ\) )

\(Li(s) \to Li(g)\) \(161\)

\(Li(g) \to Li^+(g)\) \(520\)

\(\frac {1}{2}F_2(g)\,\to F(g)\) \(77\)

\(F(g) + e^- \to F^-(g)\) (ઇલેક્ટ્રોનપ્રાપ્તિ એન્થાલ્પી)

\(Li^+ (g) + F^-(g) \to LiF(s)\) \(-1047\)

\(Li (s) + \frac {1}{2}F_2(g)\to LiF(s)\) \(-617\)

આપેલ માહિતીને આધારે ફ્લોરિનની ઇલેક્ટ્રોનિપ્રાપ્તિ એન્થાલ્પી .....\(kJ\,mol^{-1}\)

A \(-300\)
B \(-350\)
C \(-328\)
D \(-228\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(-328\)

Step-by-step Solution

Detailed explanation

Applying Hess's Law \({\Delta _f}{H^o} = {\Delta _{sub}}H + \frac{1}{2}{\Delta _{diss}}H + I.E. + E.A + {\Delta _{lattice}}H\) \({\Delta _f}{H^o} = {\Delta _{sub}}H + \frac{1}{2}{\Delta _{diss}}H + I.E. + E.A + {\Delta _{lattice}}H\)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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પ્રક્રિયા	ઉર્જાનો ફેરફાર (in \(kJ\) )
\(Li(s) \to Li(g)\)	\(161\)
\(Li(g) \to Li^+(g)\)	\(520\)
\(\frac {1}{2}F_2(g)\,\to F(g)\)	\(77\)
\(F(g) + e^- \to F^-(g)\)	(ઇલેક્ટ્રોનપ્રાપ્તિ એન્થાલ્પી)
\(Li^+ (g) + F^-(g) \to LiF(s)\)	\(-1047\)
\(Li (s) + \frac {1}{2}F_2(g)\to LiF(s)\)	\(-617\)