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निम्नलिखित अभिक्रिया के लिए `400 K` पर, साम्यावस्था स्थिरांक , के मान की गणना कीजिए -
`2NOCl(g) hArr 2NO(g) + Cl_(2)(g)`
`DeltaH^(@) = 80.0 kJ "mol"^(-1), DeltaS^(@)= 120 JK^(-1) "mol"^(-1)` पर, `R = 8.31 JK^(-1) "mol"^(-1)`

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Correct Answer - `6.61 xx 10^(-5)`
दिया है, `DeltaH^(@) = 80.0 kJ "mol"^(-1) = 80.0 xx 1000 J "mol"^(-1)`
`DeltaS = 120 JK^(-1) "mol"^(-1)`
तथा `T = 400 K`
दी गई अभिक्रिया के लिए गिब्स मुक्त ऊर्जा परिवर्तन ,
`DeltaG^(@) = DeltaH^(@) - TDeltaS^(@)`
`= (80.0 xx 1000) - (400 xx 120)`
`= 80000-48000`
`DeltaG^(@) = - 2.303 RT "log"_(10) K`
`:. "log"10 K = -(DeltaG^(@))/(2.303RT)`
`= - (32000)/(2.303 xx 8.31 xx 400) = - 4.18`
अतः `K = "antilog"_(10) (-4.18) = 6.61 xx 10^(-5)`

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