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एक अभिक्रिया के लिए `25^@C` पर एन्थेलपी परिवर्तन `(DeltaH)` और एन्ट्रोपी परिवर्तन `(DeltaS)` क्रमशः `-11.7xx10^3` जूल मोल`""^-1 ` और -105 जूल मोल`""^-1 ` केल्विन`""^-1 ` है बतलाये की क्या यह स्वतः प्रवर्तित अभिक्रिया ( spontaneous reaction ) है ?

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`DeltaG=DeltaH-TDeltaS`
`DeltaH=-11.7xx10^3` जूल मोल`""^-1 `, `T=25+273=298 K,`
`DeltaS=-105` जूल मोल`""^-1 ` केल्विन`""^-1 ` `DeltaG=?`
`:." "DeltaG=-11।7xx10^3-(-105xx298)`
`DeltaG=-11700+31290=+19590` जूल
किसी सवतः प्रवर्तित अभिक्रिया के लिए `DeltaG` का मान -ve होता है । अतः प्रवर्तित अभिक्रिया नहीं है ।

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