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एक अभिक्रिया निम्नलिखित है --- `PbO(s)+C(s)toPb(s)+CO(g)`
इस अभिक्रिया के लिए `DeltaH=108।4` किलजूल मोल`""^-1 ` तथा `DeltaS=190` जूल `K^-1` मोल`""^-1` वह ताप ज्ञात कीजिये, जिस पर अभिक्रित्या सवतः प्रवर्तित होगी ।

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`PbO(s)+C(s)toPb(s)+CO(g)`
`DeltaS=108.4` किलजूल मोल`""^-1 ` = `=108400` जूल मोल`""^-1 `
`DeltaS=190` जूल `K^-1`
`DeltaG=DeltaH-TDeltaS`
सवतः प्रवर्तित अभिक्रिया के लिए `Delta G=` तृणात्मक
अर्थात वह ताप जिस पर `T" "DeltasgtDeltaH,` अभिक्रिया सवतः प्रवर्तित होगी ।
`Tgt(DeltaH)/(DeltaS)gt570.52K`
अर्थात 570.5 K ताप से ऊपर यह सवतः प्रवर्तित होगी |

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