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सोडियम क्लोराइड के एक मोल को `298 K` पर, जल में घोलने पर होने वाले मुक्त ऊर्जा परिवर्तन की गणना कीजिए । (दिया है : `NaCl` की जालक ऊर्जा `= -777.8 kJ "mol"^(-1), NaCl` की जलयोजन ऊर्जा `= - 774.1 kJ"mol"^(-1)` तथा `298 K ` पर `DeltaS = 0.043 kJ "mol"^(-1)`)

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Correct Answer - `-9.114 kJ`
NaCl की `Delta_("विलयन") H = Delta_("जलयोजन") H - Delta_("जालक")H`
` =- 774.1 -(-777.8) = + 3.7 kJ mol^(-1)`
दिया है , `DeltaS = 0.043 kJ "mol"^(-1) ,T = 298K`
`DeltaG = DeltaH - TDeltaS`
`= 3.7 - 298 xx 0.043`
`= 3.7 - 12.814`
`= - 9.114 kJ`

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