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Q.

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 and 27°C (if all gases behave ideally) is (R=2 cal mol-1 K-1) ___

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answer is -326400.

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Detailed Solution

C2H5OHl+3O2→2CO2+3H2OlΔHcomb=−327 Kcal=−327−−1×2×3001000=−327+0.6=−326.4 Kcal=−326400cal
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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 and 27°C (if all gases behave ideally) is (R=2 cal mol-1 K-1) ___