The heat of combustion of ethanol into carbon dioxids and water is –327 kcal at constant pressure. The heat evolved (in cal) at constant volume at 27°C ( if all gases behave ideally) is (R = 2 cal mol

Question

The heat of combustion of ethanol into carbon dioxids and water is –327 kcal at constant pressure. The heat evolved (in cal) at constant volume at 27°C ( if all gases behave ideally) is (R = 2 cal mol–1 K–1) ________.

Prashant Kotian · Accepted Answer

Correct answer: .. C2H5OH() + O2(g)   2O2(g) + 3H2O(); HC = –327 Kcal HC = UC + ngRT –327 × 103 = UC + 1 × 2 × 300 UC = –326400 cal So heat evolved as constant volume is –326400 cal

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